Claude Opus 5 vs Kimi K3: Specs & Benchmark Comparison
Claude Opus 5 is developed by Anthropic, while Kimi K3 comes from Moonshot AI. Both were released in July 2026. Kimi K3 has a published size of about 2.8 trillion parameters; Anthropic has not disclosed the parameter count of Claude Opus 5.
We have 12 benchmark results for Claude Opus 5 and 3 benchmark results for Kimi K3, but they were measured on different benchmarks, so there is no like-for-like scoreboard.
Kimi K3 is the cheaper API at $3 per million input tokens and $15 per million output tokens, about 67% below Claude Opus 5 at $5 and $25. Both accept a context window of about 1M tokens. Both accept text and images as input.
| Characteristic | Claude Opus 5 | Kimi K3 |
|---|---|---|
| Company | Anthropic | Moonshot AI |
| Release Date | July 24, 2026 | July 16, 2026 |
| Parameters | — | 2.8T |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | 1.0M |
| Input Price / 1M | $5.00 | $3.00 |
| Output Price / 1M | $25.00 | $15.00 |
| Average Score | 55.2% | 95.7% |
Verdict
Kimi K3 leads in 1 out of 4 comparison categories.
Both models show comparable average scores: Claude Opus 5 — 0.6, Kimi K3 — 1.0.
Kimi K3 is 1.7x cheaper: input $3.00/1M vs $5.00/1M tokens.
Same context size: 1M tokens.
Both models were released around the same time: 7/24/2026 and 7/16/2026.
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Frequently Asked Questions
Which is better for coding — Claude Opus 5 or Kimi K3?
Which model is cheaper — Claude Opus 5 or Kimi K3?
Which has a larger context window — Claude Opus 5 or Kimi K3?
The Claude Opus 5 and Kimi K3 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Opus 5 or Kimi K3 page. See also the complete list of AI model comparisons.