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GPT-5.6 Sol API pricing
GPT-5.6 Sol is a flagship model from OpenAI with a 1,050,000-token context window. Rates below are per 1,000,000 tokens, verified October 2026, and include a promotional rate running until Nov 21, 2026.
Price list
| Token class | Rate / 1M | Notes |
|---|---|---|
| Input | $4 | Prompt tokens not served from cache |
| Cached input | $0.40 | 90% below base input |
| Cache write | $5 | Charged once when the prefix is stored |
| Output | $20 | 5.0× the input rate |
| Long context input | $8 | Above 272,000 input tokens |
| Long context output | $30 | Same threshold |
| Batch API | −50% | Input and output, results within 24 h |
Promotional rate, holds at least through Nov 21, 2026 (was $5/$30).
What GPT-5.6 Sol costs at three real workloads
Sticker prices rarely match the invoice. These three workloads use the rates above, with cache writes charged once per job and the batch discount applied only where the provider offers it.
| Workload | Requests | Tokens | Estimated cost |
|---|---|---|---|
| Support chat | 1,000 | 4K in / 600 out | $28 |
| RAG with caching | 1,000 | 50K in (45K cached) / 1K out | $58.21 |
| Nightly batch job | 10,000 | 10K in / 2K out | $400 |
Caching the 45K-token prefix saves about 74% on the RAG workload versus sending it uncached every call ($220 → $58.21). Batch mode halves the nightly job.
Where GPT-5.6 Sol sits in the market
Out of 28 models in this dataset, GPT-5.6 Sol ranks #24 cheapest by input rate, #24 by output rate, and #24 on a blended 1M-input-plus-250K-output workload.
| Model | Provider | Input | Output | Blended |
|---|---|---|---|---|
| GPT-5.6 Sol | OpenAI | $4 | $20 | $9 |
| Claude Sonnet 4.6 | Anthropic | $3 | $15 | $6.75 |
| Claude Opus 5 | Anthropic | $5 | $25 | $11.25 |
| GPT-5.4 | OpenAI | $2.50 | $15 | $6.25 |
Blended cost = 1M input tokens + 250K output tokens at list price.
FAQ
How much does GPT-5.6 Sol cost per 1M tokens?
$4 per 1M input tokens and $20 per 1M output tokens on the standard tier, rising to $8 / $30 above 272,000 input tokens.
Is prompt caching cheaper on GPT-5.6 Sol?
Yes. Cached input bills at $0.40 per 1M tokens, 90.0% below the $4 base input rate, with a one-off cache write at $5 per 1M.
Does GPT-5.6 Sol support the Batch API?
Yes. Batch requests bill at roughly half the standard input and output rates: the nightly job above costs $800 at list price and about $400 in batch mode.