Claude 4.5 Opus vs GPT-6 Astra
Claude 4.5 Opus is cheaper on output tokens, while GPT-6 Astra offers a larger context window. Choose Claude 4.5 Opus or GPT-6 Astra based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude 4.5 Opus | GPT-6 Astra |
|---|---|---|
| Provider | AI/ML API | OpenAI |
| Input / 1M tokens | $6.88 | $10.00 |
| Output / 1M tokens | $34.39 | $50.00 |
| Context window | 200K | 1.1M |
| Parameters | — | — |
| Open weights | No | — |
| Released | Nov 2025 | — |
| SWE-bench Verified score | 76.8 | — |
| LMArena (Chatbot Arena) Elo score | — | 1442 |
| LMArena WebDev Elo score | — | 1780 |
| LMArena Vision Elo score | — | 1281 |
| GPQA Diamond score | — | 95.8 |
| Epoch Capabilities Index score | — | 166 |
FAQ
Is Claude 4.5 Opus or GPT-6 Astra cheaper?
Claude 4.5 Opus is cheaper on output tokens ($34.39 vs $50.00 per 1M).
Which has the larger context window, Claude 4.5 Opus or GPT-6 Astra?
GPT-6 Astra has the larger context window (1.1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.