{"slug":"claude-opus-4.6","id":"claude-opus-4.6","type":"model","title":"Claude Opus 4.6","description":"Anthropic's most capable model and the first Opus-class model with a 1M token context window. Leads on coding benchmarks with 80.8% SWE-bench. Internal codename \"Fennec.\"","last_updated":"2026-04-10","last_verified":null,"verification_status":"unverified","markdown_url":"/content/models/claude-opus-4.6.md","html_url":"/models/claude-opus-4.6","api_url":"/api/v1/models/claude-opus-4.6.json","content_hash":"51a0a4c31212a32a86a8e6d0d5a3a7844bb7bcf4454e0237f9693476e284df48","sha256":"51a0a4c31212a32a86a8e6d0d5a3a7844bb7bcf4454e0237f9693476e284df48","provider":"Anthropic","pricing":{"input":"$5.00 / 1M tokens","output":"$25.00 / 1M tokens","note":"Significantly cheaper than Opus 4.5"},"benchmarks":{"reasoning":96,"coding":97,"math":93,"writing":95,"multilingual":88,"speed":62},"tags":["anthropic","proprietary","text","image"],"website":"https://anthropic.com","release_date":"2026-02","relationships":{"links":[],"related":[{"id":"claude-haiku-4.5","title":"Claude Haiku 4.5","type":"model","html_url":"/models/claude-haiku-4.5","markdown_url":"/content/models/claude-haiku-4.5.md","shared_tags":["anthropic","proprietary","text","image"],"score":8},{"id":"claude-sonnet-4.6","title":"Claude Sonnet 4.6","type":"model","html_url":"/models/claude-sonnet-4.6","markdown_url":"/content/models/claude-sonnet-4.6.md","shared_tags":["anthropic","proprietary","text","image"],"score":8},{"id":"gemini-3-flash","title":"Gemini 3 Flash","type":"model","html_url":"/models/gemini-3-flash","markdown_url":"/content/models/gemini-3-flash.md","shared_tags":["proprietary","text","image"],"score":5},{"id":"gemini-3.1-pro","title":"Gemini 3.1 Pro","type":"model","html_url":"/models/gemini-3.1-pro","markdown_url":"/content/models/gemini-3.1-pro.md","shared_tags":["proprietary","text","image"],"score":5},{"id":"gpt-5.4","title":"GPT-5.4","type":"model","html_url":"/models/gpt-5.4","markdown_url":"/content/models/gpt-5.4.md","shared_tags":["proprietary","text","image"],"score":5},{"id":"gpt-5.4-thinking","title":"GPT-5.4 Thinking","type":"model","html_url":"/models/gpt-5.4-thinking","markdown_url":"/content/models/gpt-5.4-thinking.md","shared_tags":["proprietary","text","image"],"score":5}],"explicit":{}},"metadata":{"title":"Claude Opus 4.6","type":"model","id":"claude-opus-4.6","provider":"Anthropic","model_type":"proprietary","release_date":"2026-02","description":"Anthropic's most capable model and the first Opus-class model with a 1M token context window. Leads on coding benchmarks with 80.8% SWE-bench. Internal codename \"Fennec.\"","last_updated":"2026-04-10","context_window":"1M tokens","website":"https://anthropic.com","license":"Proprietary","modality":["text","image"],"tags":["anthropic","proprietary","text","image"],"pricing":{"input":"$5.00 / 1M tokens","output":"$25.00 / 1M tokens","note":"Significantly cheaper than Opus 4.5"},"benchmarks":{"reasoning":96,"coding":97,"math":93,"writing":95,"multilingual":88,"speed":62},"best_for":["Complex coding projects","Long-form analysis","Agentic workflows","Tasks requiring accuracy"]},"content_text":"# Claude Opus 4.6\n\nThe best coding model available. At 80.8% SWE-bench and a 97/100 coding score, Opus 4.6 leads every other model on the benchmarks that matter most for real-world software engineering. If you're choosing between this and GPT-5.4, the decision comes down to whether you value SWE-bench leadership (Opus) or broader ecosystem integrations (GPT).\n\nThe 1M context window with no surcharge is a genuine differentiator -- Opus can hold an entire mid-size codebase in one pass. The agent teams feature is unique to Claude and worth exploring if you're building multi-step workflows. Writing quality at 95/100 is also best-in-class among frontier models, making this the rare model that excels at both code and prose.\n\nAt $5/$25 per million tokens, the output pricing is higher than GPT-5.4's $15, but significantly cheaper than the previous Opus 4.5. The speed score of 62/100 means Opus is not the model for rapid-fire chat -- it thinks carefully, and you feel it. For complex tasks that's a feature, not a bug.\n\n**When to pick something else:** If you mostly need quick answers and speed matters, Sonnet 4.6 is 80% of the quality at nearly half the output cost. For math-heavy work, GPT-5.4 Thinking edges ahead with a 97/100 math score vs. Opus's 93. And if you're locked into the OpenAI ecosystem with existing tooling, the switching cost may not be worth it.","content_length":2222,"generated_at":"2026-04-24"}