Head-to-head · OpenAI vs Anthropic
ChatGPT vs Claude Opus 5.5
Quick answer: ChatGPT stands out for strong general reasoning across domains, and it has a free tier. Claude Opus 5.5 stands out for matches Claude Fable 5.1 on most work at a much lower price. Reviewed September 2026.
Overview
ChatGPT: OpenAI's flagship conversational AI. Used by professionals across every category for drafting, summarization, structured thinking, and as a Swiss-army-knife reasoning assistant.
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.
At a glance
| Dimension | ChatGPT | Claude Opus 5.5 |
|---|---|---|
| Vendor | OpenAI | Anthropic |
| Starting price | $20/mo | API: $4 in / $20 out per M tokens |
| Pricing model | Freemium | Paid |
| Free tier | Yes | No |
| Category | Generative AI | Generative AI |
Strengths and limits
ChatGPT
- Strong general reasoning across domains
- Largest ecosystem of integrations and Custom GPTs
- Frequent model updates
Watch out for
- Hallucinates on niche or recent topics
- Token / message caps frustrate heavy users on Plus
- Model behavior changes between versions can break workflows
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
Key features
ChatGPT
- GPT-4-class reasoning on Plus and above
- File upload, web browse, image gen
- Custom GPTs and Projects with shared instructions
- Voice mode (mobile and desktop)
- API access for developers
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
Pricing compared
ChatGPT has a free tier and paid plans starting at $20/mo. The free tier is enough to test it on real work before you pay.
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.
Profession-fit verdict
8 roles where both tools are recommended. A higher relevance score means a better fit for that job.
| Profession | ChatGPT score | Claude Opus 5.5 score |
|---|---|---|
| Journalist | 10/10 | 9/10 |
| Social Worker | 10/10 | 9/10 |
| Recruiter | 10/10 | 9/10 |
| Supply Chain Manager | 10/10 | 9/10 |
| Customer Service Manager | 10/10 | 9/10 |
| Nurse | 9/10 | 9/10 |
| Doctor | 9/10 | 9/10 |
| Dentist | 9/10 | 9/10 |
Frequently asked questions
Which is better, ChatGPT or Claude Opus 5.5?
It depends on the work. ChatGPT stands out for strong general reasoning across domains, and it has a free tier. Claude Opus 5.5 stands out for matches Claude Fable 5.1 on most work at a much lower price. Across 8 professions where both are rated, ChatGPT ranks higher more often (5 roles).
How do ChatGPT and Claude Opus 5.5 compare on price?
ChatGPT has a free tier and paid plans starting at $20/mo. The free tier is enough to test it on real work before you pay. 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.
Is there a free option between ChatGPT and Claude Opus 5.5?
ChatGPT offers a free tier or free access, so you can test on real work before paying.