GPT-6 Sol
OpenAI's work tier at launch of the GPT-6 line: $2 / $10 per million tokens, replaced by GPT-6.1 Sol a week later.
What it is
GPT-6 Sol shipped September 22, 2026 alongside GPT-6 Luna at 50% below GPT-5.6 Sol's price. One week later OpenAI released GPT-6.1 Sol at the same list price with cheaper cached input and better claimed performance, so GPT-6 Sol is mainly relevant as the baseline for 'GPT-6.1 vs GPT-6' questions.
Pricing
| Input | $2.00 |
| Output | $10.00 |
| Cached input (cache read) | $0.200 |
| Cache write | $2.50 |
| Batch input | $1.00 |
| Batch output | $5.00 |
| Fast / priority input | $4.00 |
| Fast / priority output | $20.00 |
- Long context (>272K input): 2x input and cache rates, 1.5x output.
- Batch and Flex are 50% of Standard; Fast mode is 2x.
Capability highlights
- Half the price of GPT-5.6 Sol ($4 / $20).
- Supports reasoning effort none (GPT-6.1 Sol does not).
- Image-encoding bug fixed on Sep 25, 2026; OpenAI recommended rerunning image evals.
Modalities: text, image → text. Reasoning model; effort none, low, medium (default), high, xhigh, max. Prompts over 272K input tokens are billed at long-context rates for the whole request.
How to use it
API: OpenAI API model ID gpt-6-sol (Responses, Chat Completions, Batch).
Versus GPT-5.6 Sol
Price halved.
| GPT-5.6 Sol | GPT-6 Sol | |
|---|---|---|
| Input / 1M | $4.00 | $2.00 |
| Output / 1M | $20.00 | $10.00 |
| Cached input / 1M | $0.400 | $0.200 |
| Context window | not published | 1.05M |
| Max output | not published | 128K |
Published benchmark numbers
Vendor-reported, quoted from the linked announcement. Not independently verified; different vendors run benchmarks under different settings.
| Benchmark | GPT-6 Sol | Comparison in the same source | Source |
|---|---|---|---|
| GDPval-AA v2.1 (Elo) As published in Anthropic's Sonnet 5.5 comparison table. | 1487 | Sonnet 5.5: 1844 | Anthropic announcement |
Comparisons
Sources
Every number above comes from one of these pages, read on the date shown. Searched for: gpt 6 sol, sol, gpt-6 sol.
- OpenAI model page: gpt-6-sol read 2026-10-08
context, max output, cutoff, pricing - OpenAI API pricing read 2026-10-08
standard, batch, fast rates - OpenAI API changelog (Sep 22 and Sep 25, 2026 entries) read 2026-10-08
release date, image fix - Anthropic announcement: Claude Sonnet 5.5 (comparison table) read 2026-10-08
third-party vendor-published score