Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work. It is particularly strong at end-to-end software tasks, code review and bug finding, visual analysis...
Model details →Claude Opus 5 vs OpenAI: GPT-6 Astra Pro
Claude Opus 5 wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-6 Astra Pro is the same underlying model as [GPT-6 Astra](https://openrouter.ai/openai/gpt-6-astra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://develope…
Model details →Side-by-side comparison
| Capability | Claude Opus 5 | OpenAI: GPT-6 Astra Pro | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 1.1M | 🏆 OpenAI: GPT-6 Astra Pro |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $5.00 | $10.00 | 🏆 Claude Opus 5 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $25.00 | $50.00 | 🏆 Claude Opus 5 |
| 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 Claude Opus 5 better than OpenAI: GPT-6 Astra Pro?
Claude Opus 5 wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Claude Opus 5 and OpenAI: GPT-6 Astra Pro?
Input: $5.00 vs $10.00 per 1M tokens. Output: $25.00 vs $50.00 per 1M tokens.
What context windows do Claude Opus 5 and OpenAI: GPT-6 Astra Pro support?
Claude Opus 5 supports up to 1M tokens. OpenAI: GPT-6 Astra Pro supports up to 1.1M tokens.
Do both Claude Opus 5 and OpenAI: GPT-6 Astra Pro support tool calling?
Claude Opus 5: yes. OpenAI: GPT-6 Astra Pro: yes.