Kimi K3 is the world's first open 3T-class model — frontier performance across coding, knowledge work, and reasoning, with native multimodality and 1M context.
While its overall performance still trails the most powerful proprietary models, Claude Fable 5 and GPT 5.6 Sol, Kimi K3 demonstrated frontier-level performance across our evaluation suite, consistently outperforming other tested models.
K3 is @Kimi’s 2.8T-parameter MoE model with 1M context and native multimodality.
It is built for long-horizon coding and knowledge work, and the results already put it directly into the frontier-model conversation. K3 can work across large repositories, use vision while iterating on games and frontend work, and keep going through much longer agent runs with limited supervision.
And the landscape may look very different after that..!
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@zaczuo This is wild mainly because 1M context + native multimodality + strong coding changes what open model expectations are. A year ago that combo would have sounded like three separate roadmap items.
The full weights on July 27 are the part I’m watching. If teams can actually run or fine tune something this capable without handing everything to a closed API, the frontier model conversation gets a lot more interesting very quickly.
We’re excited to introduce Kimi K3, our new open frontier model built for long-context, multimodal, agentic work!
Kimi K3 has 2.8T parameters, a 1M-token context window, and native multimodal capabilities. Under the hood, it introduces Kimi Delta Attention for much faster decoding in million-token contexts, plus Attention Residuals for more efficient training.
We built K3 especially for long-horizon coding, research, financial analysis, and self-evolving agent workflows — the kinds of tasks where models need to stay coherent, use tools, inspect outputs, recover from failed attempts, and keep going.
Kimi K3 is live now on Kimi.com, Kimi Work, Kimi Code, and the Kimi API.
Open weights are coming July 27, 2026.
Would love to hear what you build with it.
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@crystal_j so incredibly excited for this! Congratulations on the launch. We can't wait to use it with PromptQL!
"Kimi K3 is the best performing model [for @Next.js], ahead of Fable, reaching a comparable success rate in less time."
This is a breakthrough moment for open models. Three months ago, @Claude by Anthropic models were ahead for work requiring correctness and accuracy. Not anymore. LFG!
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honestly the multi-file thing blew me away, dropped in like 20 mixed pdfs and slides and it actually pulled everything together coherently
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Dropped a 40-page PDF into Kimi and asked it to compare it against a competitor's doc, and it pulled the right figures without me re-uploading anything. The slides maker is rough around the edges but shockingly fast for a first pass.
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I'd love to see Kimi integrate with more file types, especially video and audio files. The real-time web search feature sounds incredibly useful, but I'm curious - how does it handle search queries with multiple keywords or complex phrases?
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wow, I'm really excited for this new model. Does it also supports image processing?
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K3 has a 1M-token context—what's the largest real-world task you've successfully completed end-to-end that simply wasn't practical with previous models?
I wonder why there is a gamboy advance in the slides? Can it make gba rom files from a prompt? Also. whats pricinging going for?
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If it can actually produce 3D models like in the demo video, that would be extremely impressive. I've used older versions of Kimi and I've found it pretty impressive, so I'm actually really hyped to try K3 when I get a chance.
Replies
Flowtica Scribe
Hi everyone!
Isn’t this pretty astonishing?
And the team is still being humble about it:
K3 is @Kimi’s 2.8T-parameter MoE model with 1M context and native multimodality.
It is built for long-horizon coding and knowledge work, and the results already put it directly into the frontier-model conversation. K3 can work across large repositories, use vision while iterating on games and frontend work, and keep going through much longer agent runs with limited supervision.
You can use it today on Kimi.com, Kimi Work, Kimi Code, or through the API.
Full weights arrive on July 27.
And the landscape may look very different after that..!
@zaczuo This is wild mainly because 1M context + native multimodality + strong coding changes what open model expectations are. A year ago that combo would have sounded like three separate roadmap items.
The full weights on July 27 are the part I’m watching. If teams can actually run or fine tune something this capable without handing everything to a closed API, the frontier model conversation gets a lot more interesting very quickly.
Kimi
We’re excited to introduce Kimi K3, our new open frontier model built for long-context, multimodal, agentic work!
Kimi K3 has 2.8T parameters, a 1M-token context window, and native multimodal capabilities. Under the hood, it introduces Kimi Delta Attention for much faster decoding in million-token contexts, plus Attention Residuals for more efficient training.
We built K3 especially for long-horizon coding, research, financial analysis, and self-evolving agent workflows — the kinds of tasks where models need to stay coherent, use tools, inspect outputs, recover from failed attempts, and keep going.
Kimi K3 is live now on Kimi.com, Kimi Work, Kimi Code, and the Kimi API.
Open weights are coming July 27, 2026.
Would love to hear what you build with it.
@crystal_j so incredibly excited for this! Congratulations on the launch. We can't wait to use it with PromptQL!
Kilo Code
@rauchg put it simply:
This is a breakthrough moment for open models. Three months ago, @Claude by Anthropic models were ahead for work requiring correctness and accuracy. Not anymore. LFG!
honestly the multi-file thing blew me away, dropped in like 20 mixed pdfs and slides and it actually pulled everything together coherently
Dropped a 40-page PDF into Kimi and asked it to compare it against a competitor's doc, and it pulled the right figures without me re-uploading anything. The slides maker is rough around the edges but shockingly fast for a first pass.
I'd love to see Kimi integrate with more file types, especially video and audio files. The real-time web search feature sounds incredibly useful, but I'm curious - how does it handle search queries with multiple keywords or complex phrases?
K3 has a 1M-token context—what's the largest real-world task you've successfully completed end-to-end that simply wasn't practical with previous models?
DiffSense
I wonder why there is a gamboy advance in the slides? Can it make gba rom files from a prompt? Also. whats pricinging going for?
If it can actually produce 3D models like in the demo video, that would be extremely impressive. I've used older versions of Kimi and I've found it pretty impressive, so I'm actually really hyped to try K3 when I get a chance.