Claude 1vsKimi K2 (0905)
Claude 1 | Kimi K2 (0905) | |
|---|---|---|
| Specifications | ||
ParametersA rough measure of how big the model is. More parameters usually means more capable and more expensive to run, though it is a poor guide on its own — a smaller, newer model often beats a larger, older one. | — | 1T |
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | 9k | 256k |
| API pricingUSD per 1M tokens · lower wins | ||
Cheapest inputLowest input rate across third-party providers, excluding the lab itself. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | — | $0.60Novita |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | — | $2.50Novita |
| BenchmarksPublished by one model only | ||
SWE-Bench VerifiedCoding — Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | — | 65.8% |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 75.1% |
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | Mar 14 2023 | Sep 5 2025 |
| Access | Proprietary | Open Weight |
Other comparisons
Frequently asked questions
Claude 1 and Kimi K2 (0905) don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 1 shipped 906 days before Kimi K2 (0905), so benchmark comparisons should account for the intervening progress.
Context windows are 9k (Claude 1) vs 256k (Kimi K2 (0905)). Claude 1 is proprietary, while Kimi K2 (0905) is open weight.
Direct benchmark comparisons are unavailable — Claude 1 and Kimi K2 (0905) don't publish scores on any of the same benchmarks.
Claude 1 was released by Anthropic on Mar 14 2023.
Kimi K2 (0905) was released by Moonshot AI on Sep 5 2025.
Claude 1 has a 9k context window; Kimi K2 (0905) has 256k.
Claude 1 is a proprietary model released by Anthropic. Kimi K2 (0905) is an open weight model released by Moonshot AI.