A side-by-side comparison of Claude Opus 5.5 and Kimi K3.1 Pro Highspeed: input/output pricing, capabilities and available endpoints, served live from openbat.ai. Both are reachable with the same API key.
| Item | Claude Opus 5.5 | Kimi K3.1 Pro Highspeed |
|---|---|---|
| Input (per 1M tokens) | $3.6 | $2 |
| Output (per 1M tokens) | $18 | $10 |
| Cache read explicit (per 1M tokens) | $0.18 | $0.1 |
| Cache write 5m (per 1M tokens) | $4.5 | $2 |
| Item | Claude Opus 5.5 | Kimi K3.1 Pro Highspeed |
|---|---|---|
| Context window | 1,000,000 | — |
| Max output | 128,000 | — |
| Item | Claude Opus 5.5 | Kimi K3.1 Pro Highspeed |
|---|---|---|
| function_calling | Yes | Yes |
| input_video | — | Yes |
| prompt_caching | Yes | — |
| structured_output | — | Yes |
| thinking | — | Yes |
| vision | Yes | Yes |
On input, Kimi K3.1 Pro Highspeed is cheaper ($3.6 vs $2 per 1M tokens). On output, Kimi K3.1 Pro Highspeed is cheaper ($18 vs $10 per 1M tokens). All prices are per million tokens in USD.
both support function_calling, vision; only Claude Opus 5.5 supports prompt_caching; only Kimi K3.1 Pro Highspeed supports input_video, structured_output, thinking.
Yes. Both are available on openbat.ai through one API key and the same OpenAI-compatible endpoint — switching means changing the model field from "claude-opus-5-5" to "kimi-k3.1-pro-highspeed", nothing else.
Both are available on openbat.ai under one API key — switching between them means changing the model field and nothing else, so you can use each where it fits rather than picking one.