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Claude Opus 5 vs GPT-5.6 Sol: price comparison
Claude Opus 5 lists at $5 / $25 and GPT-5.6 Sol at $5 / $30 per 1M input/output tokens. Neither is cheaper on input, while Claude Opus 5 is cheaper on output — so the better deal depends on whether your requests are input-heavy or output-heavy.
List prices
| Claude Opus 5 | GPT-5.6 Sol | |
|---|---|---|
| Maker | Anthropic | OpenAI |
| Input / 1M tokens | $5 | $5 |
| Output / 1M tokens | $25 | $30 |
| Through Somnus (at 2×) | $2.5 / $12.5 | $2.5 / $15 |
Cost per request
| Workload | Claude Opus 5 | GPT-5.6 Sol |
|---|---|---|
| Chat reply (1.5k in / 500 out) | $0.02 | $0.02 |
| Summary of a long document (20k in / 800 out) | $0.12 | $0.12 |
| Code generation (4k in / 3k out) | $0.10 | $0.11 |
Computed from list prices. Actual token counts vary by tokenizer and prompt.
Which should you pick?
Neither is cheaper on input, while Claude Opus 5 is cheaper on output — so the better deal depends on whether your requests are input-heavy or output-heavy.
Price is only one factor. Try both on a sample of your own prompts — with Somnus that's the same key and the same code, only the model name changes.
Questions
Can I use Claude Opus 5 and GPT-5.6 Sol with one API key?
Yes. Both are available through Somnus from the same key and balance.
Are these the official prices?
They are the list prices per 1M tokens that Somnus bills usage at. Your credit is worth at least 2× what you pay.
Try both on your own prompts
Switch between Claude Opus 5 and GPT-5.6 Sol by changing one string. New accounts get $5 free.
Get free creditRelated
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