Kimi K2.5 vs Claude Opus 5: price, context window and capabilities
Kimi K2.5 (moonshotai/kimi-k2.5) from MoonshotAI and Claude Opus 5 (anthropic/claude-opus-5) from Anthropic are both multimodal language models on the OceanToken API. Kimi K2.5 costs less per token than Claude Opus 5: $0.60 against $4.50 per 1M input tokens (87% less) and $3.00 against $22.50 per 1M output tokens (87% less). Claude Opus 5 is 10% off its official price on OceanToken, for every account. Claude Opus 5 has the larger context window: 1M tokens (1,000,000) against 262K (262,144) for Kimi K2.5. Both support tool calling, reasoning, structured outputs and image input; only Claude Opus 5 also lists file input.
Side by side
| Spec | Kimi K2.5 | Claude Opus 5 −10% |
|---|---|---|
| Model | Kimi K2.5moonshotai/ | Claude Opus 5anthropic/ |
| Publisher | MoonshotAI | Anthropic |
| Kind | Text & vision | Text & vision |
| Context window | 262K tokens262,144 | 1M tokens1,000,000 |
| Input price | $0.60 / 1M tokens | $4.50 / 1M tokens |
| Output price | $3.00 / 1M tokens | $22.50 / 1M tokens |
| Cached input price | $0.10 / 1M tokens | $0.50 / 1M tokens |
| Cache write price | – | $6.25 / 1M tokens |
| Web search price | – | $0.01 / search |
| Discount (vs official, top tier) | — | −10% |
| Inputs | text and images | text, images and files |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Yes | Yes |
About these prices
Which should you choose?
- Choose Kimi K2.5 to spend less per token: 87% less for input and 87% less for output than Claude Opus 5.
- Choose Claude Opus 5 for the longest inputs: its context window holds 1M tokens against 262K for Kimi K2.5.
- Choose Claude Opus 5 if you need file input: Kimi K2.5 does not list it.
- Not sure? Call both with the same OceanToken API key and compare them on your own prompts; each request is billed per use from one prepaid balance.
Get API Key Kimi K2.5 Claude Opus 5
Frequently asked questions
Which is cheaper, Kimi K2.5 or Claude Opus 5?
Kimi K2.5. Kimi K2.5 costs less per token than Claude Opus 5: $0.60 against $4.50 per 1M input tokens (87% less) and $3.00 against $22.50 per 1M output tokens (87% less). Claude Opus 5 is 10% off its official price on OceanToken, for every account. The OceanToken console always shows the current price.
Which has the larger context window, Kimi K2.5 or Claude Opus 5?
Claude Opus 5. Claude Opus 5 has the larger context window: 1M tokens (1,000,000) against 262K (262,144) for Kimi K2.5.
Can I call both Kimi K2.5 and Claude Opus 5 with one API key?
Yes. Both are on the OceanToken API at https://api.oceantoken.ai/v1: one API key and one prepaid balance call either model. Send the model id moonshotai/kimi-k2.5 or anthropic/claude-opus-5.
Models and publishers
Kimi K2.5 · Claude Opus 5 · All MoonshotAI models · All Anthropic models
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