Very long inputs
Choose GPT-6 Astra Pro
GPT-6 Astra Pro reads up to 1.05M tokens per request, against 200k for Claude Opus 3.
Claude Opus 3 vs GPT-6 Astra Pro: price, context and capabilities
Choose GPT-6 Astra Pro for very long inputs and the latest release; on the other points the two are level or the data is missing.
In short
- Claude Opus 3 has been retired; GPT-6 Astra Pro is the one you can still call.
- A price comparison is not possible: one of them has no comparable published price.
- GPT-6 Astra Pro reads more per request: 1.05M tokens against 200k.
- GPT-6 Astra Pro is the newer model (Sep 4, 2026, against March 2024).
- Only Claude Opus 3 offers batch api.
- Only GPT-6 Astra Pro offers reasoning, prompt caching.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Latest release
Choose GPT-6 Astra Pro
GPT-6 Astra Pro is the newer release (Sep 4, 2026, against March 2024 for Claude Opus 3).
Specifications side by side
| Claude Opus 3 | GPT-6 Astra Pro | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Category | Language models | Language models |
| Status | Retired | Generally available |
| Headline price | $30.00 / 1M tokens | $20.00 / 1M tokens |
| Input | $15.00 / 1M tokens | $10.00 / 1M tokens |
| Output | $75.00 / 1M tokens | $50.00 / 1M tokens |
| Cached input | No data | $1.00 / 1M tokens |
| Context window | 200k | 1.05M |
| Max output | No data | 128k |
| Released | March 2024 | Sep 4, 2026 |
| Knowledge cutoff | No data | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Tool calling, Structured output, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching |
| API model id | claude-3-opus-20240229 | gpt-6-astra-pro |
Frequently asked questions
Should I choose Claude Opus 3 or GPT-6 Astra Pro?
Choose GPT-6 Astra Pro for very long inputs and the latest release; on the other points the two are level or the data is missing.
Which is cheaper, Claude Opus 3 or GPT-6 Astra Pro?
A price comparison is not possible: one of them has no comparable published price.
Which has the larger context window, Claude Opus 3 or GPT-6 Astra Pro?
GPT-6 Astra Pro reads more per request: 1.05M tokens against 200k.
What is the difference between Claude Opus 3 and GPT-6 Astra Pro?
Claude Opus 3 is made by Anthropic and GPT-6 Astra Pro by OpenAI. Claude Opus 3 has been retired; GPT-6 Astra Pro is the one you can still call. A price comparison is not possible: one of them has no comparable published price. GPT-6 Astra Pro reads more per request: 1.05M tokens against 200k. GPT-6 Astra Pro is the newer model (Sep 4, 2026, against March 2024). Only Claude Opus 3 offers batch api. Only GPT-6 Astra Pro offers reasoning, prompt caching.
Which is newer, Claude Opus 3 or GPT-6 Astra Pro?
GPT-6 Astra Pro was released on Sep 4, 2026 and Claude Opus 3 on March 2024.