GPT-5.6 Sol vs Claude Opus 5
The flagship from each provider, and what the difference costs.
Side by side
| Attribute | GPT-5.6 Sol | Claude Opus 5 |
|---|---|---|
| Input, per 1M tokens | $5.00 | $5.00 |
| Output, per 1M tokens | $30.00 | $25.00 |
| Context window | 1,050,000 | 1,000,000 |
| Provider | OpenAI | Anthropic |
| Tokenizer | o200k_base | Anthropic tokenizer |
| Long-context tier | above 272,000 | none |
| Retires | no date announced | no date announced |
Which to choose
- Reading more than you write
- Both $5 per million input. Input rate cannot separate this pair.
- Writing more than you read
- GPT-5.6 Sol prices output at 6x its input rate, Claude Opus 5 at 5x — so Claude Opus 5's lead narrows as answers lengthen.
- Whole documents in one request
- Claude Opus 5 stops at 1,000,000; GPT-5.6 Sol takes 1,050,000. Past the lower ceiling only GPT-5.6 Sol accepts the request, at any price.
- Past the long-context threshold
- The ranking inverts (GPT-5.6 Sol above 272,000): GPT-5.6 Sol wins below the line, Claude Opus 5 above it at $5 against $10. Judging this pair on headline rates alone gives the wrong answer for large prompts.
- 10,000 in, 1,000 out
- $0.0800 on GPT-5.6 Sol, $0.0750 on Claude Opus 5. Over 10,000 such calls that is $50.00 in Claude Opus 5's favour.
- How these counts were arrived at
- GPT-5.6 Sol is counted exactly in your browser; Claude Opus 5 is estimated from a characters-per-token ratio. Close, not exact.
What this page does not tell you. Which model produces better answers. That depends on your task, and this site has no benchmark data — everything above is drawn from published pricing and specifications. Compare quality by running your own prompts through both.