Kimi-K2-Instruct-0905 vs o4 Mini
API pricing, benchmark indices and specs — updated 19 October 2026.
openai · B · API-only
Input / 1M
$1.10
Output / 1M
$4.40
AA index
16.7
proprietary · 200K context
Specification comparison
Differences are highlighted; identical values are muted.
| Specification | Kimi-K2-Instruct-0905 | o4 Mini |
|---|---|---|
| Deployment | Open weights · also via API | API-only (closed weights) |
| Parameters | 1,026.5 B | n/a — API-only |
| Architecture | DeepseekV3ForCausalLM | n/a — API-only |
| Context length | 262,144 | 200,000 |
| Licence | other | Proprietary |
| Commercial use | Unknown | Per API terms |
| Languages | — | n/a — API-only |
| Downloads 30d | 31,918 | n/a — API-only |
| Downloads all time | 5.2 M | n/a — API-only |
| Quantizations on the Hub | SAFETENSORS | n/a — API-only |
| Gated | No | n/a — API-only |
| First seen on the Hub | 2025-09-03 | n/a — API-only |
| API input price / 1M tokens | $0.60 | $1.10 |
| API output price / 1M tokens | $2.50 | $4.40 |
| Est. cost per 1M input + 1M output tokens | $3.10 | $5.50 |
| Cached input / 1M tokens | — | $0.28 |
| AA Intelligence Index | 15.3 | 16.7 |
| AA Coding Index | — | — |
| AA Agentic Index | — | — |
| Max output tokens | 98,304 | 100,000 |
| API providers | 1 | 1 |
| Tool calling | Yes | Yes |
| Reasoning mode | No | Yes |
API cost
Estimated cost of 1M input + 1M output tokens via OpenRouter
Kimi-K2-Instruct-0905
$3.10
o4 Mini
$5.50
Kimi-K2-Instruct-0905 is 1.8× cheaper at list price.
VRAM side by side
On RTX 4090 · 24 GB · 8K context unless noted
Kimi-K2-Instruct-0905 · fp16 @ 256K ctx
6,059.7 GB / 24 GB