OpenAI GPT-5.6 flagship tier for hard coding and agent jobs when Astra is more than you need. Prefer Sol for broad frontier work at lower list rates than GPT-6 Astra.
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Pricing snapshot
USD per 1 million tokens. Verify against the provider source before you lock budget.
| Rate | USD |
|---|---|
| Input / 1M | $4.00 |
| Output / 1M | $20.00 |
| Cached input / 1M | $0.400 |
| Cache write / 1M | $5.00 |
| Batch input / 1M | $2.00 |
| Batch output / 1M | $10.00 |
| Long-context input (≥ 272K prompt) | $8.00 |
| Long-context output (≥ 272K prompt) | $30.00 |
| Long-context cached input (≥ 272K prompt) | $0.800 |
Model details
| Detail | Value |
|---|---|
| Provider | OpenAI |
| Context window | 1.1M |
| Max output | 128K |
| Tokenizer | Exact (o200k_base) |
| Last verified | 2026-09-18 |
| API model id | gpt-5.6-sol |
Notes
Promotional list rates at least through 2026-11-21. Prompts over 272K input tokens reprice the full request at the long-context band. Fast mode is 2× standard.
More OpenAI models
Same provider catalog. Use these when you are comparing rates within one stack.
- ChatGPT-4o Latest: $5.00 in / $15.00 out
- GPT-4o: $2.50 in / $10.00 out
- GPT-4o (2024-08-06): $2.50 in / $10.00 out
- GPT-4.1: $2.00 in / $8.00 out
- GPT-4.1 (2025-04-14): $2.00 in / $8.00 out
- GPT-5.6 Terra: $2.00 in / $12.00 out
- o3: $2.00 in / $8.00 out
- GPT-5: $1.25 in / $10.00 out
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