Claude Opus 4.5
Anthropic's previous flagship. First to break 80% on SWE-bench Verified (80.9%). Best in the world for coding and autonomous agents. Now succeeded by Opus 4.6.
Pricing
Ratings
Pros
- Best coding model available (80.9% SWE-bench)
- Excellent for autonomous agents
- Effort parameter allows speed/quality tradeoff
- 76% fewer tokens than Sonnet at same quality
- Strong at long-horizon tasks
Cons
- More expensive than Sonnet
- Slower on simple tasks
- Requires Claude Pro/Max subscription for full access
Benchmark Results
Best For
Professional developers, complex codebases, autonomous agents
Quick Info
- Provider
- Anthropic
- Version
- 4.5
- Released
- Nov 2025
- Context
- 200K tokens
Features
Compare Opus 4.5 With
Related Tools
OpenClaw
OpenClaw (formerly Clawdbot/Moltbot) is a viral open-source AI agent that runs locally on your computer. With over 100,000 GitHub stars and 2 million visitors in a single week, it has become one of the most popular AI automation tools. OpenClaw can control your browser, manage files, execute terminal commands, and integrate with multiple AI models including Claude, GPT, and Gemini. It supports channel integrations like Discord and Telegram, making it a powerful hub for AI-powered automation.
Claude Sonnet 4.5
Anthropic's best value model with 70% SWE-bench. 0% error rate on internal code editing benchmarks. Best price-to-performance ratio for most use cases.
GPT-5.1 Instant
OpenAI's previous flagship with adaptive reasoning. Best for writing with a warmer, more natural tone. 75% cheaper input and 60% cheaper output than GPT-4o.
GPT-5.1 Thinking
OpenAI's advanced reasoning model. Varies thinking time dynamically based on task complexity. Twice as fast on simple tasks, twice as thorough on complex ones.
Frequently Asked Questions
Is Claude Opus 4.5 worth it in 2026?
With a rating of 4.9/5, Claude Opus 4.5 is best for Professional developers, complex codebases, autonomous agents. At $20/mo, it's competitive for its feature set.
What are the best alternatives to Claude Opus 4.5?
Top alternatives include OpenClaw, Claude Sonnet 4.5, GPT-5.1 Instant, and GPT-5.1 Thinking. Each has different strengths — use our comparison tool above to see detailed head-to-head matchups.
Does Claude Opus 4.5 have a free plan?
Claude Opus 4.5 does not currently offer a free plan. Plans start at $20/mo.