Very long inputs
Choose GPT-6 Astra
GPT-6 Astra reads up to 1.05M tokens per request, against 200k for Claude Opus 3.
Claude Opus 3 vs GPT-6 Astra: price, context and capabilities
Choose GPT-6 Astra 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 is the one you can still call.
- A price comparison is not possible: one of them has no comparable published price.
- GPT-6 Astra reads more per request: 1.05M tokens against 200k.
- GPT-6 Astra is the newer model (Sep 3, 2026, against March 2024).
- Only GPT-6 Astra 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
GPT-6 Astra is the newer release (Sep 3, 2026, against March 2024 for Claude Opus 3).
Specifications side by side
| Claude Opus 3 | GPT-6 Astra | |
|---|---|---|
| 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 3, 2026 |
| Knowledge cutoff | No data | April 2026 |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Tool calling, Structured output, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API |
| API model id | claude-3-opus-20240229 | gpt-6-astra |
Benchmarks side by side
Leader in bold.
| Benchmark | Claude Opus 3 | GPT-6 Astra |
|---|---|---|
| Intelligence Index | No data | 52.7 |
| SciCode | No data | 56.5% |
| GPQA Diamond | No data | 96.1% |
| Humanity's Last Exam | No data | 54.7% |
| MMMU-Pro (visual reasoning) | No data | 86.9% |
| Long-context reasoning (AA-LCR) | No data | 80.7% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose Claude Opus 3 or GPT-6 Astra?
Choose GPT-6 Astra 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?
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?
GPT-6 Astra reads more per request: 1.05M tokens against 200k.
What is the difference between Claude Opus 3 and GPT-6 Astra?
Claude Opus 3 is made by Anthropic and GPT-6 Astra by OpenAI. Claude Opus 3 has been retired; GPT-6 Astra is the one you can still call. A price comparison is not possible: one of them has no comparable published price. GPT-6 Astra reads more per request: 1.05M tokens against 200k. GPT-6 Astra is the newer model (Sep 3, 2026, against March 2024). Only GPT-6 Astra offers reasoning, prompt caching.
Which is newer, Claude Opus 3 or GPT-6 Astra?
GPT-6 Astra was released on Sep 3, 2026 and Claude Opus 3 on March 2024.