Fast-mode variant of [Opus 4.8](/anthropic/claude-opus-4.8) - identical capabilities with higher output speed at 2x pricing relative to regular Opus 4.8. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude…
Model details →Anthropic: Claude Opus 4.8 (Fast) vs Anthropic: Claude Fable Latest
Anthropic: Claude Opus 4.8 (Fast) and Anthropic: Claude Fable Latest are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
This model always redirects to the latest model in the Claude Fable family.
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Opus 4.8 (Fast) | Anthropic: Claude Fable Latest | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 1M | Tie |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $10.00 | $10.00 | Tie |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $50.00 | $50.00 | Tie |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Anthropic: Claude Opus 4.8 (Fast) better than Anthropic: Claude Fable Latest?
Anthropic: Claude Opus 4.8 (Fast) and Anthropic: Claude Fable Latest are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
What's the price difference between Anthropic: Claude Opus 4.8 (Fast) and Anthropic: Claude Fable Latest?
Input: $10.00 vs $10.00 per 1M tokens. Output: $50.00 vs $50.00 per 1M tokens.
What context windows do Anthropic: Claude Opus 4.8 (Fast) and Anthropic: Claude Fable Latest support?
Anthropic: Claude Opus 4.8 (Fast) supports up to 1M tokens. Anthropic: Claude Fable Latest supports up to 1M tokens.
Do both Anthropic: Claude Opus 4.8 (Fast) and Anthropic: Claude Fable Latest support tool calling?
Anthropic: Claude Opus 4.8 (Fast): yes. Anthropic: Claude Fable Latest: yes.
Compare Anthropic: Claude Opus 4.8 (Fast) with other models
vs Anthropic Claude Haiku Latestvs Anthropic Claude Sonnet Latestvs Anthropic: Claude Fable Latestvs Anthropic: Claude Opus Latest