Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
Model details →Anthropic: Claude Sonnet 4.5 (batch) vs OpenAI: GPT-5.6 Terra Pro (batch)
OpenAI: GPT-5.6 Terra Pro (batch) wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://de…
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Sonnet 4.5 (batch) | OpenAI: GPT-5.6 Terra Pro (batch) | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 1.1M | 🏆 OpenAI: GPT-5.6 Terra Pro (batch) |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $1.50 | $1.00 | 🏆 OpenAI: GPT-5.6 Terra Pro (batch) |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $7.50 | $6.00 | 🏆 OpenAI: GPT-5.6 Terra Pro (batch) |
| 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 Sonnet 4.5 (batch) better than OpenAI: GPT-5.6 Terra Pro (batch)?
OpenAI: GPT-5.6 Terra Pro (batch) wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Sonnet 4.5 (batch) and OpenAI: GPT-5.6 Terra Pro (batch)?
Input: $1.50 vs $1.00 per 1M tokens. Output: $7.50 vs $6.00 per 1M tokens.
What context windows do Anthropic: Claude Sonnet 4.5 (batch) and OpenAI: GPT-5.6 Terra Pro (batch) support?
Anthropic: Claude Sonnet 4.5 (batch) supports up to 1M tokens. OpenAI: GPT-5.6 Terra Pro (batch) supports up to 1.1M tokens.
Do both Anthropic: Claude Sonnet 4.5 (batch) and OpenAI: GPT-5.6 Terra Pro (batch) support tool calling?
Anthropic: Claude Sonnet 4.5 (batch): yes. OpenAI: GPT-5.6 Terra Pro (batch): yes.
Compare Anthropic: Claude Sonnet 4.5 (batch) with other models
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