The short answer
Claude Sonnet 5 vs GPT-6 Sol: specs side by side
| Claude Sonnet 5 | GPT-6 Sol | |
|---|---|---|
| Made by | Anthropic | OpenAI |
| Released | June 30, 2026 | September 22, 2026 |
| API model ID | claude-sonnet-5 | gpt-6-sol |
| Context window | 1M tokens | 1.05M tokens (922K input) |
| Max output | Not published | 128,000 tokens |
| Knowledge cutoff | Not published | April 20, 2026 |
| Inputs | Text, images and files | Text and images |
| API price | $2 input / $10 output per 1M tokens | $2 input / $10 output per 1M tokens |
| In AimiChat | Balanced quality · Aimi+ ($15/month) | Premium quality · Aimi Ultra ($50/month) |
Which to use for each task
Writing, editing and tone
Sonnet 5 tends to produce prose that needs less rewriting and respects style rules closely.
Multi-step reasoning and planning
Sol is positioned by OpenAI for demanding reasoning and agent tasks.
Reading long files and PDFs
Sonnet 5 takes text, image and file inputs and is careful with precise document questions.
Agentic coding tasks
OpenAI built Sol for long coding and agent work that needs a plan, several edits and a final check.
What to know before you choose
Because the list prices match, the choice comes down to the kind of work rather than cost.
In AimiChat, Claude Sonnet 5 is available from the Aimi+ plan and GPT-6 Sol from the Aimi Ultra plan.
Published benchmarks
Each company reports different tests with different settings, so these are listed per model rather than head to head.
| Model | Benchmark | Score | Reported by |
|---|---|---|---|
| GPT-6 Sol | DeepSWE v1.1 (max effort) | 68.8% | OpenAI launch post, as reported by VentureBeat and Codersera |
| GPT-6 Sol | OSWorld 2.0 offline (xhigh effort) | 60.5% | OpenAI launch post, as reported by VentureBeat and Codersera |
Try both in AimiChat
Claude Sonnet 5 runs on the Balanced quality and GPT-6 Sol on Premium. On a plan that includes both, you can send the same prompt twice in one chat, switching quality in between, and compare the answers directly. Read more about Claude Sonnet 5 and GPT-6 Sol, or see which plan includes which model.
Sources
Specifications and prices come from the model makers and API listings below. Benchmark figures are reported by the company that made the model and are not independent tests.