Fast-mode variant of [Opus 4.7](/anthropic/claude-opus-4.7) - identical capabilities with higher output speed at premium 6x pricing. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode
Model details →Anthropic: Claude Opus 4.7 (Fast) vs OpenAI: GPT-5.5 Pro
Anthropic: Claude Opus 4.7 (Fast) and OpenAI: GPT-5.5 Pro are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Opus 4.7 (Fast) | OpenAI: GPT-5.5 Pro | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 1.1M | 🏆 OpenAI: GPT-5.5 Pro |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $30.00 | $30.00 | Tie |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $150.00 | $180.00 | 🏆 Anthropic: Claude Opus 4.7 (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 4.7 (Fast) better than OpenAI: GPT-5.5 Pro?
Anthropic: Claude Opus 4.7 (Fast) and OpenAI: GPT-5.5 Pro 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 4.7 (Fast) and OpenAI: GPT-5.5 Pro?
Input: $30.00 vs $30.00 per 1M tokens. Output: $150.00 vs $180.00 per 1M tokens.
What context windows do Anthropic: Claude Opus 4.7 (Fast) and OpenAI: GPT-5.5 Pro support?
Anthropic: Claude Opus 4.7 (Fast) supports up to 1M tokens. OpenAI: GPT-5.5 Pro supports up to 1.1M tokens.
Do both Anthropic: Claude Opus 4.7 (Fast) and OpenAI: GPT-5.5 Pro support tool calling?
Anthropic: Claude Opus 4.7 (Fast): yes. OpenAI: GPT-5.5 Pro: yes.
Compare Anthropic: Claude Opus 4.7 (Fast) with other models
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