GPT-5.6 Sol API pricing — cost per million tokens
OpenAI's GPT-5.6 Sol costs $4 per million input tokens and $20 per million output tokens on the standard API tier (verified 2026-09-02). Note: Flagship tier of the GPT-5.6 family, GA since 2026-07-09. Promotional price (cut from $5 / $30 in late July), guaranteed at least through 2026-11-21. Compare it in the full pricing table or price your own prompts in the token cost calculator.
GPT-5.6 Sol price per million tokens
| direction | $ / Mtok | $ / 1K tokens |
|---|---|---|
| input (prompt) | $4 | $0.004 |
| output (completion) | $20 | $0.02 |
What real requests cost on GPT-5.6 Sol
| workload | input | output | total |
|---|---|---|---|
| Chat message (1K in / 500 out) | $0.004 | $0.01 | $0.014 |
| Long document (100K in / 2K out) | $0.40 | $0.04 | $0.44 |
| Agent session (500K in / 50K out) | $2.00 | $1.00 | $3.00 |
How GPT-5.6 Sol pricing compares
On the same chat-message workload, GPT-5.6 Sol costs 18× more than GPT-5.6 Luna (the cheapest tracked model) — capability, latency and context limits are the other side of that trade. Output tokens dominate long generations: at $20/Mtok, a 50K-token agent transcript costs $1.00 in output alone. Official rate card: OpenAI pricing.
Related: GPT-5.6 Terra pricing · GPT-5.6 Luna pricing · GPT-5.5 pricing · release timeline
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