Anthropic/ Claude
Claude Opus 4.8 (Fast)
anthropic/claude/opus-4-8-fast
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/fast-mode
Released
2026-05-27
Context window
1M
Max output
128K
Weights
Closed
Modalities
Input
TextImageDocument
Output
Text
Identity
- Version
- claude-opus-4.8-fast
Providers
| Provider | Provider model ID | Protocol | Context | Max output | Input | Output | Capabilities | Notes | Pricing | Streaming |
|---|---|---|---|---|---|---|---|---|---|---|
| OpenRouter | anthropic/claude-opus-4.8-fast | openai_chat | 1M | 128K | TextImageDocument | Text | ReasoningTool callStructured | Moderated, Default reasoning: high | input $10/M · cache read $1/M output $50/M · cache write $12.5/M | Yes |
| Kilo Gateway | anthropic/claude-opus-4.8-fast | openai_chat | 1M | 128K | TextImageDocument | Text | ReasoningTool callStructured | - | input $10/M · cache read $1/M output $50/M · cache write $12.5/M | Yes |
| Vercel AI Gateway | anthropic/claude-opus-4.8-fast | openai_chat | 1M | 128K | TextImageDocument | Text | ReasoningTool callStructured | - | input $10/M · cache read $1/M output $50/M · cache write $12.5/M | Yes |
Capabilities
ReasoningTool callStructured