Claude Opus 5
by Anthropic
Anthropic’s highest-performance frontier model. Opus 5 delivers near-Fable-5 capabilities at half the cost, optimized for knowledge work, complex reasoning, and agentic workflows. Released July 24, 2026.
Overview
Claude Opus 5 is Anthropic’s most expensive tier in the Claude 5 generation (released July 2026). It achieves near-Fable-5 performance across benchmarks while maintaining the Opus tier’s cost structure. Opus 5 represents the evolution of the Opus 4.8 line, with significant improvements in reasoning, coding, and multidisciplinary problem-solving.
Performance & Benchmarks
- Competitive with Claude Fable 5 on most benchmarks
- Advances over Opus 4.8: Improvements in agentic coding, novel problem-solving, knowledge work, computer use, multidisciplinary reasoning
- Coding performance: Superior to GPT-5.5, near-frontier levels
- Reasoning depth: Enhanced via adaptive thinking
Pricing
- Input tokens: $10 per million
- Output tokens: $50 per million
- Same pricing tier as Opus 4.8 despite performance gains
- Effective price-to-performance improvement vs. previous generation
Core Capabilities
Adaptive Thinking (Always-On)
- Automatic reasoning effort based on task complexity
- Transparent, configurable depth
- No token budget constraints
- Enables complex multi-step reasoning
Agentic Capabilities
- Autonomous task planning and decomposition
- Long-horizon task execution
- Multi-step reasoning chains
- Robust replanning on errors
Enhanced Coding
- Multi-language software engineering
- Large codebase understanding
- Architecture redesign
- Complex refactoring
- Security and performance optimization
Computer Use
- Visual interface understanding
- Desktop and web application interaction
- Terminal command execution
- Complex workflow automation
Vision & Multimodal
- Advanced image analysis
- Technical diagram interpretation
- Scientific imagery understanding
- Document and chart analysis
Knowledge Work
- Research synthesis across multiple sources
- Document analysis and extraction
- Policy and regulation interpretation
- Business analysis and strategy
Long Context
- Context window: 1,000,000 tokens (1M)
- Max output tokens: 128,000
- Efficient processing of entire codebases and document archives
- Complex multi-document reasoning
Use Cases
Enterprise Knowledge Work
- Strategic planning and decision support
- Complex business analysis
- Research synthesis at scale
- Competitive intelligence
Software Engineering
- Large-scale architectural redesign
- Multi-repository refactoring
- Complex feature development
- Security analysis and hardening
Research & Development
- Multi-domain problem-solving
- Novel hypothesis generation
- Experimental design
- Data analysis and interpretation
Autonomous Systems
- Multi-step task automation
- Long-running agent workflows
- Robust error handling and recovery
- Complex coordination tasks
Professional Services
- Legal document analysis
- Financial analysis and modeling
- Consulting research and analysis
- Policy impact assessment
Behavioral Characteristics
- Sophisticated, nuanced reasoning
- Excellent uncertainty acknowledgment
- Strong on complex instruction-following
- Professional communication style
- Superior performance on novel problems
- Better than Sonnet for edge cases
Safety & Alignment
- Safety refusal classifiers: Appropriate refusal on harmful requests
- Lower misalignment: Substantially improved over Opus 4 series
- Constitutional AI: Updated framework (January 2026)
- Robustness: Excellent prompt-injection resistance
- Hallucination control: Reliable knowledge-intensive performance
Adaptive Thinking
Like Fable 5, Opus 5 implements always-on adaptive thinking with no token budget:
- Automatically adjusts reasoning depth
- Transparent when requested
- Enables frontier-class performance on complex tasks
Comparison to Claude Fable 5 & Sonnet 5
| Feature | Opus 5 | Fable 5 | Sonnet 5 |
|---|---|---|---|
| Release | July 24, 2026 | June 9, 2026 | June 30, 2026 |
| Pricing (In/Out) | 50 | 50 | 15 (after intro period) |
| Performance Level | Near-frontier | Frontier | Upper-mid-tier |
| Context Window | 1M | 1M | 200K |
| Max Output | 128K | 128K | 128K |
| Adaptive Thinking | Yes | Yes | Yes |
| Best For | Enterprise knowledge work | Frontier reasoning | Agile teams, rapid iteration |
Platform Availability
- Claude Web App (claude.ai)
- Claude API
- AWS Bedrock
- Google Vertex AI
- Enterprise deployments
Training & Knowledge
- Training cutoff: April 2026
- Multilingual capabilities
- Current events awareness through April 2026
- Production-ready deployment
When to Use Opus 5
Use Opus 5 when you need:
- Near-frontier performance for complex reasoning
- Deep technical problem-solving
- Enterprise-grade reliability
- Advanced agentic capabilities
- Superior performance on novel problems
Consider Fable 5 if:
- You need the absolute frontier capability
- Tasks include truly novel problem-solving
- Maximum performance margin is important
- You want the “safest” model option
Consider Sonnet 5 if:
- You need good balance of performance and cost
- Tasks are more standard/predictable
- Iteration speed and volume matter
- Smaller context windows are acceptable