$ diff claude-opus-5-5 kimi-k2-8-preview
Claude Opus 5.5 vs Kimi K2.8 Preview
Values come from Claude Opus 5.5 and Kimi K2.8 Preview, where each is cited to its source. This page states no benchmark result and ranks neither model — it puts two published specifications next to each other. Where a lab has not published a figure, the row says so rather than guessing.
AnthropicClaude Opus 5.5
- context
- 1M
- weights
- closed
- $/M in
- $4
- $/M out
- $20
- context
- 1M
- weights
- closed
- $/M in
- —
- $/M out
- —
What actually differs
- Context window
- Identical — both accept 1M tokens, so context length is not a reason to pick either.
- Recency
- Claude Opus 5.5 shipped 11 days after Kimi K2.8 Preview (2026-09-22 vs 2026-09-11).
Full spec
| Attribute | Claude Opus 5.5 | Kimi K2.8 Preview |
|---|---|---|
| Developer | Anthropic | Moonshot AI |
| Released | 2026-09-22 | 2026-09-11 |
| Context window | 1M tokens | 1,000,000 |
| Pricing | $4/M input · $20/M output · cache reads $0.20/M · cache writes $5/M | not recorded |
| License | proprietary (API-only; no weight release) | proprietary |
| Availability | Claude apps, Claude Code, Claude API as `claude-opus-5-5`, Amazon Bedrock, Google Cloud Vertex AI, Microsoft Foundry | Kimi API platform, Kimi Code, Kimi Work |