Claude 4.5 Opus vs Chat Latest (GPT-5.5 Instant)
Chat Latest (GPT-5.5 Instant) is cheaper on output tokens, while Chat Latest (GPT-5.5 Instant) offers a larger context window. Choose Claude 4.5 Opus or Chat Latest (GPT-5.5 Instant) based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude 4.5 Opus | Chat Latest (GPT-5.5 Instant) |
|---|---|---|
| Provider | AI/ML API | ZenMux |
| Input / 1M tokens | $6.88 | $5.00 |
| Output / 1M tokens | $34.39 | $30.00 |
| Context window | 200K | 400K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Nov 2025 | May 2026 |
| SWE-bench Verified score | 76.8 | — |
FAQ
Is Claude 4.5 Opus or Chat Latest (GPT-5.5 Instant) cheaper?
Chat Latest (GPT-5.5 Instant) is cheaper on output tokens ($30.00 vs $34.39 per 1M).
Which has the larger context window, Claude 4.5 Opus or Chat Latest (GPT-5.5 Instant)?
Chat Latest (GPT-5.5 Instant) has the larger context window (400K tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.