GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...
Model details →OpenAI: GPT-5.5 vs Anthropic Claude Sonnet Latest
Anthropic Claude Sonnet Latest wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
This model always redirects to the latest model in the Anthropic Claude Sonnet family.
Model details →Side-by-side comparison
| Capability | OpenAI: GPT-5.5 | Anthropic Claude Sonnet Latest | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1.1M | 1M | 🏆 OpenAI: GPT-5.5 |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $5.00 | $2.00 | 🏆 Anthropic Claude Sonnet Latest |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $30.00 | $10.00 | 🏆 Anthropic Claude Sonnet Latest |
| 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 OpenAI: GPT-5.5 better than Anthropic Claude Sonnet Latest?
Anthropic Claude Sonnet Latest wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between OpenAI: GPT-5.5 and Anthropic Claude Sonnet Latest?
Input: $5.00 vs $2.00 per 1M tokens. Output: $30.00 vs $10.00 per 1M tokens.
What context windows do OpenAI: GPT-5.5 and Anthropic Claude Sonnet Latest support?
OpenAI: GPT-5.5 supports up to 1.1M tokens. Anthropic Claude Sonnet Latest supports up to 1M tokens.
Do both OpenAI: GPT-5.5 and Anthropic Claude Sonnet Latest support tool calling?
OpenAI: GPT-5.5: yes. Anthropic Claude Sonnet Latest: yes.
Compare OpenAI: GPT-5.5 with other models
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