OpenAI › GPT-5.6 Sol › Pricing
$4 / $20per 1M tokens in / out
$0.40cache read · −90%
$0.50per task at medium?
#51on OpenRouter by tokens · 404.7B / week
Price sheetper 1M tokens
| Input | $4 | list |
| Output | $20 | |
| Cache read | $0.40 | −90% vs input |
| Cache write | $5 | +25% vs input |
| Context · max output | 1.1M · 128K | tokens |
Cost per task by effort?
low$0.2639.4
mediumAPI default$0.5042.2
high$0.8146
xhigh$1.1847.3
max$1.9949.5
per taskHumanity's Last Exam
Same price per token at every effort; the bill grows with reasoning tokens. max costs 3.9× medium for +7.3 points.
Where to buy3 providers · per 1M tokens
| Provider | Input | Output | Context |
|---|---|---|---|
| Azure | $4 | $20 | 1.1M |
| OpenAIlab | $4 | $20 | 1.1M |
| Amazon Bedrock | $4.40 | $22 | 1.1M |
In OpenAI's line-upper 1M in / out
| GPT-5.2 (2025-12-11) | $1.75 / $14 | −40% |
| GPT-5.4 (2026-03-05) | $2.50 / $15 | −30% |
| GPT-4o (2024-05-13) | $5 / $15 | −6% |
| GPT-5.6 Sol | $4 / $20 | this model |
| GPT Rosalind Discovery | $5 / $25 | +25% |
| GPT Rosalind Research | $5 / $25 | +25% |
| GPT Chat Latest | $5 / $30 | +41% |
Cheaper for the same workvs GPT-5.6 Sol at medium
| GPT-6.1 Sol xhigh | -22% | score +30% | $0.39 |
| MiMo v2.6 Pro thinkingOpen | -74% | score +18% | $0.13 |
| DeepSeek V4.1 Flash 1017 maxOpen | -48% | score +15% | $0.26 |
| Claude Haiku 5.5 max | -58% | score +11% | $0.21 |
| MiniMax M3.1 Flash thinking | -56% | score +9% | $0.22 |
Pricing questions
How much does GPT-5.6 Sol cost?›
$4 per 1M input tokens and $20 per 1M output tokens. Cached input is $0.40. One Intelligence Index task costs about $0.50 at the default effort.
Is GPT-5.6 Sol free to use?›
There is no free API tier.
How much does prompt caching save?›
Cache reads cost $0.40 per 1M, 90% below the input price. Writing to the cache costs $5 per 1M.
Is GPT-5.6 Sol cheaper than GPT-4?›
Yes: $4 / $20 against $30 / $60, 79% less per token.
How does effort change the price?›
The price per token is the same at every effort. Higher effort spends more reasoning tokens: a task costs $0.26 at low, $0.50 at medium, $0.81 at high, $1.18 at xhigh, $1.99 at max.
What is a cheaper alternative to GPT-5.6 Sol?›
GPT-6.1 Sol at xhigh effort costs -22% per task with a score +30% on Humanity's Last Exam.