Kimi K3 Release Date: Two Launches, Explained

Kimi K3's open weights release is scheduled for July 27, 2026. That is when Moonshot AI will make the full 2.8 trillion parameter model available for public download, along with a technical report covering architecture, training, and evaluation details.

If you have been seeing conflicting information about whether K3 is already out or still coming, here is why. Moonshot ran two separate launches. The model went live on July 16 through the Kimi app, Kimi Work, Kimi Code, and the Kimi API. You can use it right now through those channels. But the open weights, the part that lets anyone download, self-host, and modify the model, are not out yet. That is the July 27 date.

What Happened on July 16

On July 16, Moonshot AI officially introduced Kimi K3 as its most capable model: 2.8 trillion parameters, a 1-million-token context window, native vision (text, image, and video input), and always-on reasoning at max effort by default.

From that date, K3 became available through Moonshot's own ecosystem:

• Kimi.com (web chat)
• The Kimi app on iOS, Android, and HarmonyOS
• Kimi Work desktop (version 3.1.0 or later) for knowledge work tasks
• Kimi Code for terminal-based coding via the /model command
• The Kimi API at $0.30 per million tokens for cache-hit input, $3.00 for cache-miss input, and $15.00 for output

So if you want to use Kimi K3 right now through Moonshot's products or API, you can. The model is live and accessible. Moonshot also noted that its inference architecture, Mooncake, achieves a cache hit rate above 90% in coding workloads, which brings the effective input cost closer to the $0.30 cached tier for iterative tasks.

What Happens on July 27

The July 27 date is when Moonshot plans to release the full model weights publicly. Their official blog states: the full model weights will be released by July 27, 2026, with further details on the architecture, training, and evaluations coming alongside the Kimi K3 technical report.

This is the open weights release. Once the weights are public, developers and organizations will be able to download the full 2.8 trillion parameter model and run it on their own infrastructure. That opens the door for self-hosting, fine-tuning for specific use cases, integrating K3 into custom pipelines, and building on top of the model without ongoing API costs or dependency on Moonshot's servers.

Moonshot is also working with inference partners and open-source maintainers ahead of the release to ensure compatibility across the ecosystem. They have contributed a KDA (Kimi Delta Attention) prefill cache implementation to the vLLM community, which will be released alongside the model weights.

Why the Distinction Matters

The difference between "model is live via API" and "model weights are downloadable" is significant, and it is a pattern you will see with most major AI model releases.

When a model is API-only, you are renting access. You send requests to the provider's servers, pay per token, and work within their infrastructure. That is what Kimi K3 has been since July 16. It works well for most use cases, but you are dependent on the provider for uptime, pricing, and any usage restrictions.

When model weights are released as open-weight, the dynamic changes. You can run the model yourself. You can modify it. You can deploy it in environments where sending data to an external API is not an option. For companies building products on top of AI models, open weights mean control over costs at scale, the ability to fine-tune for a specific domain, and no single point of failure tied to one provider's API.

At 2.8 trillion parameters, Kimi K3 is the largest open-weight model announced to date, making this particular weights release one of the more closely watched events in the open-source AI space right now.

Quick Reference: Kimi K3 Release Timeline

July 16, 2026: Model launched. Available via Kimi.com, Kimi app, Kimi Work, Kimi Code, and the Kimi API. Pricing live at $0.30/$3.00/$15.00 per million tokens (cached/uncached input/output).

July 27, 2026 (scheduled): Open weights release. Full model weights become publicly downloadable. Technical report with architecture, training, and evaluation details published alongside.

Post-launch (dates TBD): Additional reasoning effort levels (low and high) to be introduced. Currently, only max effort is available at launch.

What This Means for Builders

If you want to try Kimi K3 today, you do not need to wait for July 27. The model is live and accessible through Moonshot's products and API right now. For most use cases, including coding, research, and knowledge work, the API route is the simplest path to start testing.

If you are planning to self-host, fine-tune, or build K3 into a product, the July 27 open weights release is the date to watch. That is when the model moves from "a service you can use" to "a tool you can own."

Either way, the broader trend here matters. Models at the frontier performance tier are becoming accessible outside of closed APIs. That means the platforms and tools builders rely on, including AI-powered app builders like Emergent, will continue to get more capable as the models powering them improve.

Stay tuned to Emergent News for more on AI tools, launches, and what they mean for builders.