GPT-5.6 Sol API Pricing
$5.00 input · $30.00 output per 1M tokens — OpenAI's flagship ceiling for the hardest requests.
GPT-5.6 Sol is OpenAI's flagship: $5.00 input and $30.00 output per million tokens, with cached input at $0.50. In 2026 the value winners in nearly every price band are mid-tier or budget models — Sol exists for the rare request that justifies paying for the ceiling.
Price per 1M tokens
GPT-5.6 Sol · USD official list price
| Tier | Rate |
|---|---|
| Input | $5.00 |
| Output | $30.00 |
| Cache hit | $0.50 |
DeepSeek lists official prices in CNY; USD uses ≈ 6.9 exchange rate
Best for
$5.00 / $30.00
Standard-tier list price for input and output per million tokens.
$0.50 cached input
Cached input is 10× cheaper than uncached, rewarding stable prompt prefixes.
50% Batch discount
Offline workloads qualify for OpenAI's Batch API discount, halving output cost.
The hard 10% of requests: rare, complex reasoning and high-stakes generation where a mid-tier or budget model demonstrably fails. The other 90% should never pay flagship prices.
Billing notes
Published API pricing as of September 2026, standard tier, USD per million tokens. GPT-5.6 models all qualify for the 50% Batch API discount for offline workloads.
Sol vs the competition
Against DeepSeek V4 Pro (¥9.00/$27.00 peak), Sol's $30.00 output is roughly 10% pricier than V4 Pro's peak output in USD terms yet represents the same flagship tier — with V4 Pro winning on off-peak economics and 1M context.
Frequently Asked Questions
How much does GPT-5.6 Sol cost per million tokens?
GPT-5.6 Sol bills $5.00 per million input tokens and $30.00 per million output tokens on the standard tier. Cached input is $0.50 per million. OpenAI also offers a 50% Batch API discount for offline workloads, bringing output to $15.00.
When does it make sense to pay flagship GPT-5.6 Sol prices?
Only for the hard 10% of requests: rare, complex reasoning where a mid-tier or budget model demonstrably fails. In 2026 the value winners in nearly every price band are mid-tier or budget models — Sol exists for the rare request that justifies it.
Does GPT-5.6 Sol have cache pricing?
Yes. GPT-5.6 Sol charges $0.50 per million tokens for cached input (10× cheaper than the $5.00 uncached input rate), so keeping a stable prompt prefix materially lowers effective input cost.
Related model pricing
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