MoonshotAIFastReleased 4 September 2025
Kimi K2 0905 pricing, context and benchmark
Kimi K2 0905 is the September update of [Kimi K2 0711](moonshotai/kimi-k2).
262K
Input context
98K
Output context
$0.6
Official input
$2.5
Official output
n/a
AA index
01 · Model Overview
Everything that matters, in one table
Context, pricing, cache, modalities and tooling, from the model registry and Artificial Analysis.
| Model | Kimi K2 0905 |
| Model ID | moonshotai/kimi-k2-0905 |
| Provider | MoonshotAI |
| Release date | 4 September 2025 |
| Status | Generally available |
| Input context | 262,144 tokens |
| Output context | 98,304 tokens |
| Official input pricing | $0.6 per 1M tokens |
| Official output pricing | $2.5 per 1M tokens |
| Cache read pricing | Not published |
| Market input pricing | $0.6 per 1M (cheapest route) |
| Market output pricing | $2.5 per 1M (cheapest route) |
| Input modalities | text |
| Output modalities | text |
| Reasoning control | Not exposed |
| Tool support | Functions, tool choice, structured outputs |
| Tokenizer | Other |
| Provider routes | 1 endpoint |
| Artificial Analysis index | Not published |
| Speed | Not published |
| Knowledge cutoff | Not publicly stated |
Input and output support
| Modality | Input | Output | Billed at |
|---|---|---|---|
| Text | ✓ yes | ✓ yes | $0.6 in |
| Image | no | no | not supported |
| Audio | no | no | not supported |
| Video | no | no | not supported |
| File (PDF) | no | no | not supported |
02 · Overview
What is 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...
Kimi K2 0905 carries a 262K token window, uses the Other tokenizer and is served by MoonshotAI. On Hoodgen it sits in the Fast tier of the model menu next to its siblings, so you can switch mid conversation without losing the thread.
03 · Release
Release and what changed from the previous version
Released4 September 2025
This is the only release of Kimi K2 0905 on OpenRouter, released 4 September 2025. The provider has not published a knowledge cutoff, so treat training data as recent but unconfirmed for very new events.
04 · Capabilities
Features and capabilities
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Function calling
Tools, tool choice and parallel calls, which is what agent loops need to act on results.
{ }
Structured outputs
Schema constrained JSON with response_format, so no parse and retry loop in your code.
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Seeds
A seed can be pinned so the same prompt is reproducible across test runs.
07 · Use cases
What can you do with Kimi K2 0905?
High volume drafts
Captions, titles, product blurbs and rewrite passes where cost per call dominates.
Inline assistants
Autocomplete, quick replies and menu helpers that must answer inside a second.
Batch classification
Tagging, routing and extraction across thousands of short inputs.
Cheap agent loops
Tool calling loops that do not need frontier grade reasoning.
09 · Pricing
Kimi K2 0905 pricing
Official pricing
List price
$0.6 / 1M in
$2.5 / 1M out
- 262K context
- text input
Cheapest route
$0.6 / 1M in
$2.5 / 1M out
- 1 route on OpenRouter
- What Hoodgen routes to first
- Same model, lower bill
Market pricing, every route
| Provider | Tier | Input | Output | Cache read | Uptime 24h |
|---|---|---|---|---|---|
| Novita | standard | $0.6 | $2.5 | n/a | 100.0% |
API pricing and cost calculator
| Rate | Per call | Total | Credits |
|---|---|---|---|
| Cheapest route | $0.0158 | $7.88 | 7482 |
| List price | $0.0158 | $7.88 | 7482 |
10 · Developers
API and developer information
| Model ID | moonshotai/kimi-k2-0905 |
| Endpoint | https://openrouter.ai/api/v1/chat/completions |
| Parameters | frequency_penalty · logprobs · max_tokens · presence_penalty · repetition_penalty · response_format · seed · stop · structured_outputs · temperature · tool_choice · tools · top_k · top_logprobs · top_p |
| Streaming | Yes, server sent events |
| Modality string | text->text |
| Max prompt tokens | 262,144 |
| Max completion tokens | 98,304 |
curl https://openrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "moonshotai/kimi-k2-0905",
"messages": [{ "role": "user", "content": "Summarise this document." }],
"max_tokens": 1024
}'11 · Limitations
Model limitations
| Text only output | It cannot generate images, audio or video. Pair it with an image model on Hoodgen when you need visuals. |
| Output cap | 98,304 tokens per request. Long deliverables have to be chunked. |
| Benchmarks not published | Artificial Analysis does not publish an Intelligence Index for this release, so no benchmark score is claimed here. |
| Knowledge cutoff | The provider does not state a fixed cutoff for every release. Verify very recent events against search. |
| Depth ceiling | Fast tier: strong on throughput, weaker than flagship tiers on long multi step reasoning. |
12 · Comparison
Kimi K2 0905 vs other MoonshotAI models
| Model | Context | Input /1M | Output /1M | AA index | Released |
|---|---|---|---|---|---|
| Kimi K2 0905 | 262K | $0.6 | $2.5 | n/a | 2025 |
| Kimi K2 Thinking | 262K | $0.6 | $2.5 | n/a | 2025 |
| Kimi K2.6 | 262K | $0.39 | $1.8 | n/a | 2026 |
| Kimi K3.1 Pro | 1.05M | $0.237 | $8.411 | 46 | Oct 2026 |
13 · Privacy
Privacy and data policy
- On Hoodgen, prompts and attachments answer that request and stay in your conversation history so you can reopen it. They are not used to train models.
- Requests route through OpenRouter to MoonshotAI and are covered by that provider's API terms.
- Do not paste secrets or personal data you would not send to any hosted model.
14 · FAQ
Kimi K2 0905 questions, answered
Kimi K2 0905 is a fast model from MoonshotAI, released 4 September 2025. Kimi K2 0905 is the September update of [Kimi K2 0711](moonshotai/kimi-k2).
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Start chatting with Kimi K2 0905
Free to try on Hoodgen AI, with a live credit estimate before every send. No API key, no setup.