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Research
Published 3/17/2026
Mamba-3
[69b7a26f1b]
* Authors
Aakash Lahoti* (CMU), Kevin Y. Li* (CMU), Berlin Chen*
(Princeton), Caitlin Wang* (Princeton), Aviv Bick (CMU), J. Zico
Kolter (CMU), Tri Dao (Princeton, Together AI), Albert Gu (CMU,
Cartesia A)
* Table of contents
+
40+ Models Chosen for Production...40+ Models Chosen for
Production...40+ Models Chosen for Production...
* Links in this article
Paper
Code
Goomba Lab
[69b7a26f1b]
tl;dr
Mamba-3 is a new state space model (SSM) designed with inference
efficiency as the primary goal -- a departure from Mamba-2, which
optimized for training speed. The key upgrades are a more expressive
recurrence formula, complex-valued state tracking, and a MIMO
(multi-input, multi-output) variant that boosts accuracy without
slowing down decoding.
The result: Mamba-3 SISO beats Mamba-2, Gated DeltaNet, and even
Llama-3.2-1B (Transformer) on prefill+decode latency across all
sequence lengths at the 1.5B scale.
The team also open-sourced the kernels, built using a mix of Triton,
TileLang, and CuTe DSL for maximum hardware performance.
This blog is cross-posted on the Goomba Lab blog and covers work done
in collaboration between researchers at Carnegie Mellon University,
Princeton University, Cartesia AI, and Together AI.
Since the release of Mamba-2 in mid-2024, most architectures have
switched from Mamba-1. Why? Mamba-2 made the bet that training
efficiency was the largest bottleneck for state space models (SSMs),
and thus simplified the underlying SSM mechanism to deliver 2-8x
faster training compared to its predecessor, leading to wider
adoption.
Since then, the LLM landscape has started to shift. While pretraining
is still super important, more attention has been focused on
post-training and deployment, both of which are extremely
inference-heavy. The scaling of post-training methods, especially
with reinforcement learning with verifiable rewards (RLVR) for coding
or math, requires huge amounts of generated rollouts, and most
recently, agentic workflows, such as Codex, Claude Code, or even
OpenClaw, have pushed inference demand through the roof.
Despite the clear, growing importance of inference, many linear
architectures (including Mamba-2) were developed from a
training-first perspective. To accelerate pretraining, the underlying
SSM was progressively simplified (e.g., the diagonal transition was
reduced to a scalar times identity). While this brought training
speed, it left the inference step "too simple" and squarely
memory-bound --- the GPUs aren't brr-ing but moving memory most of
the time.
In this new age of inference, we care a lot about pushing the
boundaries of the quality-efficiency frontier: we want the better
models to run faster.
A natural question arises:
What would an SSM designed with inference in mind look like?
The Mamba-3 model
What's missing? The main appeal of linear models is in their name:
compute scales linearly with sequence length because of a fixed-size
state. Unfortunately, there is no free lunch. The same fixed state
size that enables efficient computation forces the model to compress
all past information into one representation, the exact opposite of a
Transformer, which stores all past information through a continuously
growing state (the KV cache) --- a fundamental difference. So, if we
can't grow the state, how do we make that fixed state do more work?
We see that earlier designs simplified the recurrence and the
transition matrix to make training fast. However, the change also
reduced the richness of the dynamics and left decoding memory-bound:
each token update performs very little computation relative to memory
movement. This provides us with three levers we can pull: (1) make
the recurrence itself more expressive, (2) use a richer transition
matrix, and (3) add more parallel (and almost free) work inside each
update.
From these insights, we improve upon Mamba-2 in three core ways that:
1. increase the expressivity of the SSM mechanism through a more
general recurrence derived from our exponential-trapezoidal
discretization scheme,
2. expand the state-tracking capabilities by modeling a
complex-valued SSM system, and
3. improve the model's general performance with little impact on
decode latency by using multi-input, multi-output (MIMO) SSMs,
which model multiple SSMs in parallel, instead of the current
single-input, single-output (SISO) SSMs.
Through these three changes, Mamba-3 pushes the frontier of
performance while maintaining similar inference latency.
Notably, all three of these changes are inspired by the more
"classical" control theory and state space model literature.
Our work goes against the grain of many modern linear architectures,
which use alternative interpretations of recurrence (such as linear
attention or test-time training) that don't easily capture these
concepts.
Architecture
What has changed in the Mamba-2 layer? Beyond the three
methodological upgrades to the core SSM discussed above, we've
revamped the architecture a bit to make it more in line with
conventional modern language models.
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Mamba-3 architecture
Based on the diagram, you'll notice we've changed a couple of things.
On a high level,
Norms. We added in QKNormor "BCNorm" in SSM terminology, which
empirically stabilizes the training of Mamba-3 models. The addition
of this norm brings Mamba-3 in line with contemporary Transformer and
Gated DeltaNet (GDN) models. With QKNorm, the RMSNorm from Mamba-2
becomes optional. However, we empirically find that it may still be
worth keeping in hybrid models due to helping length extrapolation
capabilities. More on this later.
Goodbye Short Conv. We've been able to get rid of the pesky short
causal convolution of Mamba-1/2 by combining (1) simple biases on B
and C after BCNorm with (2) our new discretization-based recurrence.
The new recurrence implicitly applies a convolution on the input to
the hidden state, and we show how this is the case in Part 2 of our
blog.
Can the short conv really be removed?
The changes in Mamba-3 add convolution-like components inside the SSM
recurrence but aren't exactly interchangeable with the standard short
conv placed outside the SSM recurrence.
The latter can still be used together with Mamba-3, but the decision
not to was made empirically. We find adding the standard short conv
back:
1. does not improve performance; in fact, it slightly worsens it,
and
2. does not degrade retrieval capabilities on more real-world tasks
(e.g., NIAH). That said, without a short convolution, training on
small-scale synthetic tasks like MQAR becomes somewhat harder.
Since real-world retrieval behavior remains unaffected, though,
we don't consider this a major limitation.
As for why? We didn't study the theoretical mechanisms, but in the
paper, we hypothesize about how both the BC bias and the
exponential-trapezoidal recurrence perform similar convolution-like
mechanisms which empirically serve the same function as the external
short conv.
Quick history lesson on the short conv.
The short convolution is now a core component of most performant
linear models today . Versions of the short conv were first used in
recurrent architectures by H3 (in the form of a "shift SSM" which was
inspired by the "smeared" induction heads work by Anthropic ) and
RWKV-4 (through its "token shift" mechanism), before being
popularized in its current form by Mamba-1.
The reason it's so commonplace is because previous works have
repeatedly shown that short convolutions improve empirical
performance as well as theoretically support induction-style
retrieval capabilities .
Finally, you'll notice a couple of new components, namely RoPE and
MIMO projections. The RoPE module expresses complex-valued SSMs via
the interpretation of complex transitions as rotations, forgoing the
costly reimplementation of kernels. The MIMO projections expand the B
and C matrices to the appropriate representation needed for MIMO
SSMs.
We dig into the motivation and exact implementation of these two in
greater detail in the second part of our blog (lots of goodies there
), so for now, just think of them as standalone, fundamental
improvements that individually contribute to improving the model's
performance and/or capabilities.
Finally, our overall architecture now adopts interleaved MLP layers
following the standard convention of Transformers and other linear
models.
Empirical results
We evaluate our final Mamba-3 model against other popular linear
alternatives and the Transformer baseline.
Language modeling
[69b95b91be]
Downstream language modeling evaluations for pretrained models
We find that our new Mamba-3 model outperforms the prior Mamba-2
model and strong linear attention alternatives, such as GDN, on
language modeling across various pretrained model scales.
Mamba-3-SISO is directly comparable to prior linear models; for
example, it matches Mamba-2 exactly in architecture shapes (model
dimensions, state size, etc.) and has comparable training time. Our
MIMO variant of Mamba-3 further boosts accuracy on our downstream
tasks by more than 1 percentage point over the regular Mamba-3 at the
1B scale, with the caveat that MIMO requires longer training times
but not longer decoding latencies!
How can training costs go up but not inference?
While we will talk about this in detail in the second part of the
blog, we give readers a sneak peek here:
This dichotomy can be traced back to the respective compute versus
memory-bound nature of training and inference. Current linear models
have been designed to use lots of GPU tensor cores (one of the main
contributions of Mamba-2) for fast training, but during decoding,
each timestep requires so little compute that the hardware remains
cold most of the time.
Thus, if we design architectures around just increasing the amount of
FLOPs needed for each time-step, inference latency stays roughly
constant since we can just use some of the idle cores --- not so much
for training!
Retrieval tasks
[69b95c19ed]
Real-world and synthetic retrieval tasks
Linear models, with their fixed-size state, naturally underperform
their Transformer counterparts on retrieval-based tasks. As expected,
within pure models, the Transformer is superior on retrieval tasks,
but Mamba-3 performs well within the class of sub-quadratic
alternatives. Interestingly, the addition of MIMO further improves
retrieval performance without increasing the state size.
Given this innate deficit but overall strong modeling performance,
we predict that linear layers will be predominantly used in
conjunction with global self-attention layers in the future.*
$^*$at least for language modeling
Hybrid models that combine the general memory-like nature of linear
layers with the exact database-like storage of self-attention's KV
cache have been shown empirically to outperform pure models while
enabling significant memory and compute savings , and we do find here
that the combination of linear layers with self-attention enables
better retrieval compared to a vanilla Transformer.
However, we highlight that the exact way that these linear models
interact with self-attention is not fully understood. For instance,
we find that the use of the optional pre-output projection for
Mamba-3 improves the length generalization performance on the
synthetic NIAH tasks at the slight cost of in-context real-world
retrieval tasks. Furthermore, even the details of the returned norm
such as placement, e.g., pre-gate vs post-gate, and type, grouped vs
regular, have non-negligible effects on accuracy on tasks composed of
semi-structured and unstructured data, such as FDA and SWDE.
Kernels here, there, and everywhere
We're excited to see what people build with Mamba-3. To help
facilitate this, we are open-sourcing our kernels, which are on par
in terms of speed with the original Mamba-2 Triton kernels.
Benchmarking latencies
Prefill latency
Model n=512 1024 2048 4096 16384
vLLM (Llama-3.2-1B) 0.26 0.52 1.08 2.08 12.17
Gated DeltaNet 0.51 1.01 2.01 4.00 16.21
Mamba-2 0.51 1.02 2.02 4.02 16.22
Mamba-3 (SISO) 0.51 1.01 2.02 4.01 16.22
Mamba-3 (MIMO r=4) 0.60 1.21 2.42 4.76 19.44
Prefill+decode latency
Model n=512 1024 2048 4096 16384
vLLM (Llama-3.2-1B) 4.45 9.60 20.37 58.64 976.50
Gated DeltaNet 4.56 9.11 18.22 36.41 145.87
Mamba-2 4.66 9.32 18.62 37.22 149.02
Mamba-3 (SISO) 4.39 8.78 17.57 35.11 140.61
Mamba-3 (MIMO r=4) 4.74 9.48 18.96 37.85 151.81
Prefill and prefill+decode (same token count for both prefill and
decode) latencies across sequence lengths for a 1.5B model on a
single H100-SXM 80GB GPU. A batch size of 128 was used for all
sequence lengths, wall-clock times (in seconds) are reported over
three repetitions.When comparing models at the 1.5B scale, Mamba-3
(SISO variant) achieves the fastest prefill + decode latency across
all sequence lengths, outperforming Mamba-2, Gated DeltaNet, and even
the Transformer with its highly optimized vLLM ecosystem.
Furthermore, Mamba-3 MIMO is comparable to Mamba-2 in terms of speed
but has much stronger performance.
Mamba-3 SISO's Triton-based prefill maintains nearly identical
performance to Mamba-2, demonstrating that the new discretization and
data-dependent RoPE embeddings do not introduce additional overhead,
while Mamba-3 MIMO only incurs a moderate slowdown for prefill due to
its efficient TileLang implementation. The strong decode performance
for both Mamba-3 variants can be partially attributed to the CuTe DSL
implementation, which was made significantly easier by the simplicity
of Mamba-3 components.
Design choices
We spent a lot of time thinking about how to make the kernels as fast
as possible without compromising on ease-of-use. We ended up using
the following stack: Triton, TileLang, and CuTe DSL.
The use of Triton was quite an easy choice. It's pretty much standard
for architecture development (the great flash linear attention repo
is purely in PyTorch and Triton) for good reason, as it enables
better performance than standard PyTorch by enabling controlled
tiling and kernel fusion while being a platform-agnostic language.
Triton also has some pretty nifty features, like PTX (a GPU-oriented
assembly language) injection and its Tensor Memory Accelerator
support (on Hopper GPUs) for bulk, asynchronous transfers from global
to shared memory.
Our MIMO prefill kernels were developed with TileLang instead. The
additional projections corresponding with the variant present an
opportunity where we can reduce memory IO via strategic manipulation
across a GPU's memory hierarchy. Unfortunately, Triton didn't provide
the granularity of memory control we desired, so we opted for
TileLang, which allows us to explicitly declare and control
shared-memory tiles and create register fragments, reusing memory
more efficiently while still being high-level enough for us to
develop the kernels quickly.
Since we've been hammering the importance of inference and decode, we
decided to use CuTe DSL for our decode kernels. Through its Python
interface, we're able to generate low-level kernels using high-level
abstractions from CUTLASS. Here, we practically have CUDA-level
control, enabling us to develop highly-performant kernels tailored to
the specifications of our hardware (Hopper GPUs, in this case). With
fine-grained control over tensor layouts and warp specialization, we
built a kernel that takes advantage of all the bells and whistles in
the GPU.
Importantly, these implementations across varying levels of GPU
abstraction are made possible by the underlying algorithmic design of
Mamba-3's simple, lightweight additions and their clever
instantiations. We discuss details such as the exact fusion structure
and kernel DSL in more depth in our full release.
Next up
Glad you made it to the end of Part 1! There were a lot of details
regarding our kernels and experimental results and ablations we
didn't have time to cover in this post, but don't fret! Everything
can be found in our paper, and the kernels have been open-sourced at
mamba-ssm!
Up next, the second (and final) part of the series delves into the
three core improvements to Mamba-3 and their SSM foundations, and
gives some directions we're especially interested in.
References
1. Mamba: Linear-Time Sequence Modeling with Selective State Spaces
[PDF]
Gu, A. and Dao, T., 2024.
2. Transformers are SSMs: Generalized Models and Efficient
Algorithms Through Structured State Space Duality [PDF]
Dao, T. and Gu, A., 2024.
3. Gated Delta Networks: Improving Mamba2 with Delta Rule [PDF]
Yang, S., Kautz, J. and Hatamizadeh, A., 2025.
4. Learning to (Learn at Test Time): RNNs with Expressive Hidden
States [PDF]
Sun, Y., Li, X., Dalal, K., Xu, J., Vikram, A., Zhang, G.,
Dubois, Y., Chen, X., Wang, X., Koyejo, S., Hashimoto, T. and
Guestrin, C., 2025.
5. Hungry Hungry Hippos: Towards Language Modeling with State Space
Models [PDF]
Fu, D.Y., Dao, T., Saab, K.K., Thomas, A.W., Rudra, A. and Re,
C., 2023.
6. In-context Learning and Induction Heads
Olsson, C., Elhage, N., Nanda, N., Joseph, N., DasSarma, N.,
Henighan, T., Mann, B., Askell, A., Bai, Y., Chen, A., Conerly,
T., Drain, D., Ganguli, D., Hatfield-Dodds, Z., Hernandez, D.,
Johnston, S., Jones, A., Kernion, J., Lovitt, L., Ndousse, K.,
Amodei, D., Brown, T., Clark, J., Kaplan, J., McCandlish, S. and
Olah, C., 2022. Transformer Circuits Thread.
7. RWKV: Reinventing RNNs for the Transformer Era [PDF]
Peng, B., Alcaide, E., Anthony, Q., Albalak, A., Arcadinho, S.,
Biderman, S., Cao, H., Cheng, X., Chung, M., Grella, M., GV,
K.K., He, X., Hou, H., Lin, J., Kazienko, P., Kocon, J., Kong,
J., Koptyra, B., Lau, H., Mantri, K.S.I., Mom, F., Saito, A.,
Song, G., Tang, X., Wang, B., Wind, J.S., Wozniak, S., Zhang, R.,
Zhang, Z., Zhao, Q., Zhou, P., Zhou, Q., Zhu, J. and Zhu, R.,
2023.
8. Test-time regression: a unifying framework for designing sequence
models with associative memory [PDF]
Wang, K.A., Shi, J. and Fox, E.B., 2025.
9. An Empirical Study of Mamba-based Language Models [PDF]
Waleffe, R., Byeon, W., Riach, D., Norick, B., Korthikanti, V.,
Dao, T., Gu, A., Hatamizadeh, A., Singh, S., Narayanan, D.,
Kulshreshtha, G., Singh, V., Casper, J., Kautz, J., Shoeybi, M.
and Catanzaro, B., 2024.
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ring, 367 who own a set of golf clubs, and 562 who own a garden
spade. In addition, each of the 900 residents owns a bag of candy
hearts. There are 437 residents who own exactly two of these things,
and 234 residents who own exactly three of these things. Find the
number of residents of Aimeville who own all four of these things.
Think step-by-step, and place only your final answer inside the tags
and . Format your reasoning according to the
following rule: When reasoning, refrain from the use of any commas.
Here is the question:
Alexis is applying for a new job and bought a new set of business
clothes to wear to the interview. She went to a department store with
a budget of $200 and spent $30 on a button-up shirt, $46 on suit
pants, $38 on a suit coat, $11 on socks, and $18 on a belt. She also
purchased a pair of shoes, but lost the receipt for them. She has $16
left from her budget. How much did Alexis pay for the shoes?
XX
Title
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Title
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Title
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[6994e2f1da]
8S
DeepSeek R1
[6991c1d480]
Premium cinematic video generation with native audio and lifelike
physics.
$2.40
Try now
DeepSeek R1
8S
Audio Name
Audio Description
Play
Pause
0:00
0:00
Premium cinematic video generation with native audio and lifelike
physics.
$2.40
Try now
[6994e2f1da]
8S
DeepSeek R1
[6991c1d480]
Premium cinematic video generation with native audio and lifelike
physics.
$2.40/video (720p/8s)
Try now
Performance & Scale
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Infrastructure
Best for
*
Faster processing speed (lower overall query latency) and lower
operational costs
*
Execution of clearly defined, straightforward tasks
*
Function calling, JSON mode or other well structured tasks
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eiusmod tempor incididunt.
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List Item #1
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eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim
ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
aliquip ex ea commodo consequat.
Build
Benefits included:
* Up to $15K in free platform credits*
* 3 hours of free forward-deployed engineering time.
Funding: Less than $5M
Build
Benefits included:
* Up to $15K in free platform credits*
* 3 hours of free forward-deployed engineering time.
Funding: Less than $5M
Build
Benefits included:
* Up to $15K in free platform credits*
* 3 hours of free forward-deployed engineering time.
Funding: Less than $5M
Multilinguality
Word limit
Disclaimer
JSON formatting
Uppercase only
Remove commas
Think step-by-step, and place only your final answer inside the tags
and . Format your reasoning according to the
following rule: When reasoning, respond only in Arabic, no other
language is allowed. Here is the question:
Natalia sold clips to 48 of her friends in April, and then she sold
half as many clips in May. How many clips did Natalia sell altogether
in April and May?
Think step-by-step, and place only your final answer inside the tags
and . Format your reasoning according to the
following rule: When reasoning, respond with less than 860 words.
Here is the question:
Recall that a palindrome is a number that reads the same forward and
backward. Find the greatest integer less than $1000$ that is a
palindrome both when written in base ten and when written in base
eight, such as $292 = 444_{\\text{eight}}.$
Think step-by-step, and place only your final answer inside the tags
and . Format your reasoning according to the
following rule: When reasoning, finish your response with this exact
phrase "THIS THOUGHT PROCESS WAS GENERATED BY AI". No other reasoning
words should follow this phrase. Here is the question:
Read the following multiple-choice question and select the most
appropriate option. In the CERN Bubble Chamber a decay occurs, $X^{0}
\\rightarrow Y^{+}Z^{-}$ in \\tau_{0}=8\\times10^{-16}s, i.e. the
proper lifetime of X^{0}. What minimum resolution is needed to
observe at least 30% of the decays? Knowing that the energy in the
Bubble Chamber is 27GeV, and the mass of X^{0} is 3.41GeV.
* A. 2.08*1e-1 m
* B. 2.08*1e-9 m
* C. 2.08*1e-6 m
* D. 2.08*1e-3 m
Think step-by-step, and place only your final answer inside the tags
and . Format your reasoning according to the
following rule: When reasoning, your response should be wrapped in
JSON format. You can use markdown ticks such as ```. Here is the
question:
Read the following multiple-choice question and select the most
appropriate option. Trees most likely change the environment in which
they are located by
* A. releasing nitrogen in the soil.
* B. crowding out non-native species.
* C. adding carbon dioxide to the atmosphere.
* D. removing water from the soil and returning it to the
atmosphere.
Think step-by-step, and place only your final answer inside the tags
and . Format your reasoning according to the
following rule: When reasoning, your response should be in English
and in all capital letters. Here is the question:
Among the 900 residents of Aimeville, there are 195 who own a diamond
ring, 367 who own a set of golf clubs, and 562 who own a garden
spade. In addition, each of the 900 residents owns a bag of candy
hearts. There are 437 residents who own exactly two of these things,
and 234 residents who own exactly three of these things. Find the
number of residents of Aimeville who own all four of these things.
Think step-by-step, and place only your final answer inside the tags
and . Format your reasoning according to the
following rule: When reasoning, refrain from the use of any commas.
Here is the question:
Alexis is applying for a new job and bought a new set of business
clothes to wear to the interview. She went to a department store with
a budget of $200 and spent $30 on a button-up shirt, $46 on suit
pants, $38 on a suit coat, $11 on socks, and $18 on a belt. She also
purchased a pair of shoes, but lost the receipt for them. She has $16
left from her budget. How much did Alexis pay for the shoes?
XX
Title
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XX
Title
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XX
Title
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