Head-to-head · Anthropic vs xAI
Claude Opus 5.5 vs Grok 4.7
Quick answer: Claude Opus 5.5 stands out for matches Claude Fable 5.1 on most work at a much lower price. Grok 4.7 stands out for large context window at a moderate price. 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.
Grok 4.7: Grok 4.7 is xAI's latest flagship model for coding, agentic tasks and knowledge work. It has a 500,000-token context window, accepts text and image input, and supports adjustable reasoning levels.
At a glance
| Dimension | Claude Opus 5.5 | Grok 4.7 |
|---|---|---|
| Vendor | Anthropic | xAI |
| Starting price | API: $4 in / $20 out per M tokens | API: $2 to $4 in / $6 to $12 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
Grok 4.7
- Large context window at a moderate price
- Strong on coding and agent tasks
- Real-time knowledge through the xAI ecosystem
Watch out for
- Smaller enterprise ecosystem than OpenAI, Anthropic or Google
- Price steps up for prompts over 200,000 tokens
- Fewer professional integrations
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
Grok 4.7
- 500,000-token context window
- Text and image input
- Flexible reasoning levels
- Available through the xAI 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.
Grok 4.7 is priced by usage rather than by seat: API: $2 to $4 in / $6 to $12 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
Frequently asked questions
Which is better, Claude Opus 5.5 or Grok 4.7?
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. Grok 4.7 stands out for large context window at a moderate price.
How do Claude Opus 5.5 and Grok 4.7 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. Grok 4.7 is priced by usage rather than by seat: API: $2 to $4 in / $6 to $12 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 Grok 4.7?
Neither lists a permanent free tier. Look for trials or usage-based pricing to test on real work first.