Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks. It achieves 74.5% on SWE-bench Verified and shows notable gains...
Model details →Anthropic: Claude Opus 4.1 vs Claude Opus 5 (Fast)
Claude Opus 5 (Fast) wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
Fast-mode variant of [Opus 5](/anthropic/claude-opus-5) - identical capabilities with higher output speed at 2x pricing relative to regular Opus 5. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-…
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Opus 4.1 | Claude Opus 5 (Fast) | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 200K | 1M | 🏆 Claude Opus 5 (Fast) |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $15.00 | $10.00 | 🏆 Claude Opus 5 (Fast) |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $75.00 | $50.00 | 🏆 Claude Opus 5 (Fast) |
| 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 4.1 better than Claude Opus 5 (Fast)?
Claude Opus 5 (Fast) wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Opus 4.1 and Claude Opus 5 (Fast)?
Input: $15.00 vs $10.00 per 1M tokens. Output: $75.00 vs $50.00 per 1M tokens.
What context windows do Anthropic: Claude Opus 4.1 and Claude Opus 5 (Fast) support?
Anthropic: Claude Opus 4.1 supports up to 200K tokens. Claude Opus 5 (Fast) supports up to 1M tokens.
Do both Anthropic: Claude Opus 4.1 and Claude Opus 5 (Fast) support tool calling?
Anthropic: Claude Opus 4.1: yes. Claude Opus 5 (Fast): yes.
Compare Anthropic: Claude Opus 4.1 with other models
vs Anthropic Claude Haiku Latestvs Anthropic Claude Sonnet Latestvs Anthropic: Claude Fable Latestvs Anthropic: Claude Opus Latest