GPT-5.6 Sol vs GPT-5.5
OpenAI vs OpenAI · Prices checked 12 August 2026
GPT-5.6 Sol and GPT-5.5 land at the same blended rate of $12.50 per million tokens, so cost alone will not separate them.
Both offer the same 1,050,000-token context window. GPT-5.6 Sol was released Jul 2026; GPT-5.5 Apr 2026.
Pricing and capacity
| Metric | GPT-5.6 Sol | GPT-5.5 | Difference |
|---|---|---|---|
| Input / 1M tokens | $5.00 | $5.00 | level |
| Output / 1M tokens | $30.00 | $30.00 | level |
| Blended · 70/30calculated | $12.50 | $12.50 | level |
| Blended · 50/50calculated | $17.50 | $17.50 | level |
| Blended · 80/20calculated | $10.00 | $10.00 | level |
| Blended · 20/80calculated | $25.00 | $25.00 | level |
| Job cost · 100K + 10Kcalculated | $0.800 | $0.800 | level |
| Job cost · 1M + 100Kcalculated | $8.00 | $8.00 | level |
| Context window | 1,050,000 | 1,050,000 | level |
Input and output rates are as published by each provider. Blended and job-cost rows are calculated comparison metrics, not published prices — how they are derived.
Benchmarks
These two models do not currently report scores on any of the same benchmark suites, so there is no like-for-like capability comparison to show. Rather than pad the page with one-sided numbers, the benchmark leaderboards list every score we do hold.
What each model is for
GPT-5.6 Sol
OpenAI · Frontier
The flagship tier of the GPT-5.6 family, aimed at complex reasoning, long-horizon agentic work, coding, biology and cybersecurity. In OpenAI's naming the number is the generation and Sol is a durable capability tier, so Sol advances on its own cadence rather than being replaced by the next decimal. Standard short-context pricing is $5/$30 per MTok with cached input at $0.50; requests above 272K tokens are billed at the long-context rate of $10/$45.
- Frontier reasoning
- Long-horizon agentic execution
- Coding and code review
- Programmatic tool calling in the Responses API
GPT-5.5
OpenAI · Frontier
Released April 2026 and positioned by OpenAI as smarter and faster for complex coding, research and data-analysis work. It shipped alongside Thinking and Pro variants, neither available on the free tier, and has a published system card.
- Complex coding and data analysis
- 1M-token context
- Thinking and Pro variants for harder work
- Published system card
Frequently asked questions
Which is cheaper, GPT-5.6 Sol or GPT-5.5?
GPT-5.6 Sol and GPT-5.5 land at the same blended rate of $12.50 per million tokens, so cost alone will not separate them. Blended cost weights input at 70% and output at 30%; price your own token split for an exact answer, since the cheaper model on a blended basis is not always cheaper for your workload.
Which has the larger context window, GPT-5.6 Sol or GPT-5.5?
Both offer the same 1,050,000-token context window. The context window caps everything in a single request: prompt, retrieved documents, conversation history and the model’s own output all share it.
Can I compare GPT-5.6 Sol and GPT-5.5 on my own numbers?
Yes. Open both in the side-by-side comparison tool to see every field at once, or use the token calculator to price your actual prompt and monthly request volume against each model. Both are free and need no sign-up.
Price it for your own workload
Related matchups
Terms used on this page
Prices and scores are recomputed on every deploy from the catalogue. Prices checked 12 August 2026.