Chat with all AIClaude Opus 5.5
Claude Opus 5.5 is Anthropic's most capable Claude 5.5 model and one of the strongest coding models available in 2026. Use it when quality matters more than speed: complex code, long documents and decisions that need careful reasoning.
Made byAnthropic
GroupHardest problems
SpeedThorough
In Pro30/day
Best for
- Complex coding and architecture
- Long documents and contracts (with human review)
- Hard reasoning and analysis
- High-stakes writing
Strengths
- Top-tier code quality and debugging
- Very careful, thorough reasoning
- Excellent long-context reading
- Clear about assumptions and risks
Things to keep in mind
- Slower — use Sonnet or Haiku for quick tasks
- Pro includes 30 requests a day on max-tier models
- Not a substitute for a lawyer, doctor or accountant
Prompts to try
Design the data model and API for this feature, list trade-offs.
Review this contract page: summarize obligations and red flags for my lawyer.
Find the performance bottleneck in this code and propose a fix.
Other Claude models
Claude Haiku 5.5 · Claude Sonnet 5.5 · Claude Fable 5.2
Frequently asked questions
Is Claude Opus 5.5 free to try?
Yes. Your 3 free requests work with Claude Opus 5.5. On Pro, Claude Opus 5.5 is part of the most powerful tier with 30 requests a day.
What is Claude Opus 5.5 best at?
Complex coding and architecture, long documents and contracts (with human review), hard reasoning and analysis.
Does Claude Opus 5.5 browse the web here?
No. In Chat with all AI models don't run live web searches. Share the page you're on with This page to ground the answer.
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