GPT-5.6 Sol pricing
OpenAI · API id gpt-5.6-sol · verified 2026-10-18
| Input | $4.00 |
| Cached input (cache hit) | $0.40 |
| Cache write | $5.00 |
| Output | $20.00 |
| Batch discount | 50% |
| Context window | 1,050,000 tokens |
| Max output | 128,000 tokens |
| Above 272K prompt tokens | $8.00 in / $30.00 out |
USD per 1M tokens unless noted. Official source
Estimate your workload on GPT-5.6 Sol →
What GPT-5.6 Sol costs for real workloads
| Workload | GPT-5.6 Sol | Mistral Large 4 | DeepSeek V4 Pro | Grok 4.7 | Gemini 4 Argon |
|---|---|---|---|---|---|
| 10,000 chatbot replies 2,000 input + 400 output tokens each, 50% of the prompt cached | $124 | $15.86 | $29.48 | $49.00 | $61.00 |
| One 30-step coding agent run 12K system + tools prompt, 1K output and 3K tool result per step, caching on | $2.06 | $0.29 | $0.38 | $1.45 | $0.76 |
| 1M documents classified (batch) 600 input + 20 output tokens each, batch API where available | $1,400 | $225 | $871 | $1,320 | $700 |
Compared with the cheapest other flagship models. Change the numbers in the calculator.
Billing notes
Previous generation (alias gpt-5.6). Page says "promotional pricing is available at least through November 21, 2026" - may rise after. Long context: prompts >272K input tokens bill the whole request at 2x input/cache and 1.5x output. Reasoning tokens billed as output. Regional/data-residency endpoints +10%.
Where GPT-5.6 Sol ranks by use case
Position by cost among all models that fit each workload (1 = cheapest).
- Cheapest LLM for coding agents: #31 of 36 (Per run (cached): $2.06)
- Cheapest LLM for RAG chatbots: #31 of 36 (Per 1,000 answers: $26.60)
- Cheapest LLM for batch classification and extraction: #31 of 36 (Classify 1M docs: $1,400)
- Long-context document analysis (400K tokens): #27 of 29 (10 questions, cached: $7.50)
- Cheapest LLM for high-volume customer support: #31 of 36 (Per 1,000 replies: $10.60)
Counting tokens for a prompt? The token counter estimates GPT-5.6 Sol tokens (OpenAI (o200k_base) tokenizer) and input cost.
Head-to-head comparisons
Other OpenAI models
- GPT-6 Astra: $10.00 / $50.00
- GPT-5.5: $5.00 / $30.00
- GPT-6.1 Sol: $2.00 / $10.00
- GPT-6 Sol: $2.00 / $10.00
- GPT-5.6 Terra: $2.00 / $12.00
- GPT-5.4 mini: $0.75 / $4.50
- GPT-5.6 Luna: $0.20 / $1.20
- GPT-6 Luna: $0.10 / $0.50
FAQ
How much does GPT-5.6 Sol cost per 1M tokens?
GPT-5.6 Sol costs $4.00 per 1M input tokens and $20.00 per 1M output tokens at standard rates (verified 2026-10-18).
Does GPT-5.6 Sol support prompt caching?
Yes. Cached input is billed at $0.40 per 1M tokens, and writing to the cache costs $5.00 per 1M tokens.
Is there a batch discount for GPT-5.6 Sol?
Yes. The batch API is 50% cheaper than standard requests.
What is the context window of GPT-5.6 Sol?
1,050,000 tokens, with up to 128,000 output tokens. Prompts over 272,000 tokens are billed at $8.00 input and $30.00 output for the whole request.