Head-to-head · Anthropic vs OpenAI
Claude Opus 5.5 vs GPT-6 Sol
Quick answer: Claude Opus 5.5 stands out for matches Claude Fable 5.1 on most work at a much lower price. GPT-6 Sol stands out for strong balance of quality and cost. Reviewed September 2026.
Overview
Claude Opus 5.5: Claude Opus 5.5, released on 22 September 2026, is Anthropic's newest Opus model. Anthropic reports it performs at the level of Claude Fable 5.1 on most work while costing about 40% less to run than Opus 5, with a focus on agentic coding, computer use and knowledge work.
GPT-6 Sol: GPT-6 Sol, launched on 22 September 2026, brings GPT-6 Astra's technology to a faster, cheaper model at $2 and $10 per million tokens. OpenAI states these are permanent prices, not promotional rates.
At a glance
| Dimension | Claude Opus 5.5 | GPT-6 Sol |
|---|---|---|
| Vendor | Anthropic | OpenAI |
| Starting price | API: $4 in / $20 out per M tokens | API: $2 in / $10 out per M tokens |
| Pricing model | Paid | Paid |
| Free tier | No | No |
| Category | Generative AI | Generative AI |
Strengths and limits
Claude Opus 5.5
- Matches Claude Fable 5.1 on most work at a much lower price
- Faster output than Opus 5
- Strong on coding and knowledge work such as financial analysis
Watch out for
- Newest release, so fewer independent long-term evaluations
- Output still costs $20 per million tokens
- Sonnet or Haiku are cheaper for routine tasks
GPT-6 Sol
- Strong balance of quality and cost
- Price is permanent, not introductory
- Good default for production workloads
Watch out for
- Below Astra on the hardest tasks
- Newest release with limited track record
- Competes closely with Claude Sonnet 5 on price
Key features
Claude Opus 5.5
- 1M-token context window at standard pricing
- Agentic coding, code review and bug detection
- Computer use and complex multi-step tasks
- Clearer, more direct communication style
- Available in Claude apps, the API, Claude Code, AWS, Google Cloud and Microsoft Azure
GPT-6 Sol
- Built on GPT-6 Astra technology
- Permanent $2 and $10 per million token pricing
- Faster responses than Astra
- Available through the OpenAI API
Pricing compared
Claude Opus 5.5 is priced by usage rather than by seat: API: $4 in / $20 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
GPT-6 Sol is priced by usage rather than by seat: API: $2 in / $10 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
Profession-fit verdict
8 roles where both tools are recommended. A higher relevance score means a better fit for that job.
| Profession | Claude Opus 5.5 score | GPT-6 Sol score |
|---|---|---|
| Nurse | 9/10 | 8/10 |
| Doctor | 9/10 | 8/10 |
| Dentist | 9/10 | 8/10 |
| Pharmacist | 9/10 | 8/10 |
| Physical Therapist | 9/10 | 8/10 |
| Mental Health Counselor | 9/10 | 8/10 |
| Veterinarian | 9/10 | 8/10 |
| Medical Coder | 9/10 | 8/10 |
Frequently asked questions
Which is better, Claude Opus 5.5 or GPT-6 Sol?
It depends on the work. Claude Opus 5.5 stands out for matches Claude Fable 5.1 on most work at a much lower price. GPT-6 Sol stands out for strong balance of quality and cost. Across 8 professions where both are rated, Claude Opus 5.5 ranks higher more often (8 roles).
How do Claude Opus 5.5 and GPT-6 Sol compare on price?
Claude Opus 5.5 is priced by usage rather than by seat: API: $4 in / $20 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing. GPT-6 Sol is priced by usage rather than by seat: API: $2 in / $10 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
Is there a free option between Claude Opus 5.5 and GPT-6 Sol?
Neither lists a permanent free tier. Look for trials or usage-based pricing to test on real work first.