Claude Opus 5.5 Fast API price
Other versions: earlier: Claude Opus 5 Fast from $7.64 / $38.21. Compare versions
Sold by Cheaper Inference.
The only price here comes from Cheaper Inference, a seller we have not verified (our read). Test it on your own prompts before you rely on it.
Versions
| Version | What it is | Sellers | From, in / out per 1M |
|---|---|---|---|
| Claude Opus 5.5 Fast this pageclaude-opus-5.5-fast | Main listing | 1 | $8.00 / $40.00 |
| Claude Opus 5 Fastclaude-opus-5-fast | Earlier generation | 1 | $7.64 / $38.21 |
Why there are several: the undated name can move to a newer build when the developer updates it, while a dated snapshot is meant to stay fixed, which can suit pipelines that need repeatable behaviour; an experimental build tests new features. Sellers price each version separately and not every seller offers every version, so check a seller's own docs for the build it serves.
Cost calculator: where to buy, and what it costs you
Pick a use case, a volume and a provider. Monthly figures assume 30 days.
1,500 input and 400 output tokens per request, 30% of input cached.
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Test a seller of this model with your own key, on your own machine.
- Context window
- 1M1,000,000 tokens
- Cached input
- from $0.40per 1M tokens
- Last checked
- 26 Oct, 00:17 UTC
Price history
Cheapest standard price per 1M tokens, recorded every 6 hours since 16 Oct 2026.
- Cheaper Inference raised input $5.20 to $8.00 (+54%), output $26.00 to $40.00 (+54%)
- Cheaper Inference first listed in our data at $5.20 / $26.00
More from Anthropic: Claude Opus 5.5 $4.00 · Claude Sonnet 5.5 $2.00 · Claude Fable 5.1 $10.00