$ diff claude-opus-5 kimi-k3
Claude Opus 5 vs Kimi K3
Anthropic and Moonshot AI, side by side. Every value below is the one recorded on the model’s own wiki page, with its citation — nothing is estimated.
AnthropicClaude Opus 5
- context
- 1M
- weights
- closed
- $/M in
- $5
- $/M out
- $25
- context
- 1M
- weights
- open
- $/M in
- $3
- $/M out
- $15
What actually differs
- Context window
- Identical — both accept 1M tokens, so context length is not a reason to pick either.
- Input price
- Kimi K3 at $3/M against $5/M — 1.7× cheaper to feed. Standard rates: one of these labs also quotes a lower cached-input tier, which applies only when a prefix is reused — see the full spec below.
- Output price
- Kimi K3 at $15/M against $25/M — 1.7× cheaper to generate. Output dominates the bill on most agentic workloads, where the model writes far more than it reads.
- Weights
- Kimi K3 publishes weights (Modified MIT (commercial use permitted; weights publicly downloadable)); Claude Opus 5 is API-only. That decides self-hosting, air-gapped deployment and fine-tuning before any capability question does.
- Recency
- Claude Opus 5 shipped 8 days after Kimi K3 (2026-07-24 vs 2026-07-16).
Full spec
| Attribute | Claude Opus 5 | Kimi K3 |
|---|---|---|
| Developer | Anthropic | Moonshot AI |
| Released | 2026-07-24 | 2026-07-16 |
| Context window | 1M tokens | 1M tokens |
| Pricing | $5/M input · $25/M output (standard); $10/M · $50/M (Fast mode, research preview) | $0.30/M cache-hit input · $3.00/M cache-miss input · $15.00/M output |
| License | proprietary | Modified MIT (commercial use permitted; weights publicly downloadable) |
| Availability | Claude.ai, API (`claude-opus-5`), Bedrock (`anthropic.claude-opus-53`), Vertex AI, Microsoft Foundry, Claude Code, Cowork | Kimi Code, Kimi app, Kimi API; weights on Hugging Face (`moonshot-ai/kimi-k3`, released 2026-07-27) |
Values come from Claude Opus 5 and Kimi K3, 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. How these pages are produced.