UltraGPT
MoonshotAI: Kimi K2 0905
Kimi K2 0905 is the September update of [Kimi K2 0711](moonshotai/kimi-k2). It is a large-scale Mixture-of-Experts (MoE) language model developed by Moonshot AI, featuring 1 trillion total parameters with 32...
Intelligence overview
262.1K tok
Context window
98.3K tok
Max output
What MoonshotAI: Kimi K2 0905 can do.
Development
Tool calling
Calls external functions mid-response, then continues reasoning from the result.
Structured output
Returns responses constrained to a JSON schema, ready to parse without cleanup.
Streaming
Streams tokens as they're generated instead of waiting on the full response.
Performance
Design Arena — ranked #91 across 2 categories
Pay for what you use.
Every model in UltraGPT runs behind one flat subscription — this is the underlying per-token cost the catalog tracks.
$0.6 / 1M tok
$2.5 / 1M tok
Built for serious work.
Build
Generate and refactor code, with the ability to run and verify tool calls and return structured, parseable output.
Research
Holds up to 262.1K tokens of source material in context without losing the thread.
Ask MoonshotAI: Kimi K2 0905 anything.
A preview of the real UltraGPT composer — the model you see here is the model you get.
Continues in the UltraGPT app — one login, every model.
How MoonshotAI: Kimi K2 0905 stacks up.
The closest models in the catalog by provider, capability and score — real entries, pulled from the same directory.
Technical details.
Specification
- Context window
- 262.1K tokens
- Max output
- 98.3K tokens
- Input modalities
- Text
- Output modalities
- Text
- Knowledge cutoff
- Dec 31, 2024
- Release date
- Sep 4, 2025
- Streaming
- Supported
- Tool calling
- Supported
- JSON mode
- Supported
More from Moonshot AI, and everything else.
This model is one entry in the full UltraGPT catalog — browse the rest, compare pricing and context windows, or filter by capability.