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Claude Opus 4.6 vs Claude Sonnet 4
Comprehensive side-by-side LLM comparison
Claude Opus 4.6 leads with 26.4% higher average benchmark score. Claude Opus 4.6 offers 64.0K more tokens in context window than Claude Sonnet 4. Claude Sonnet 4 is $12.00 cheaper per million tokens. Overall, Claude Opus 4.6 is the stronger choice for coding tasks.
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Anthropic
Claude Opus 4.6, released by Anthropic in February 2026, is a large language model from the Claude 4 family designed for complex agent orchestration, extended reasoning, and long-form code generation. It features a 200K token context window (extendable to 1M tokens in beta), 128K maximum output tokens, native image understanding, and extended thinking with both standard and adaptive effort modes. Opus 4.6 targets multi-step agentic workflows, parallel tool use, and applications requiring sustained reasoning over large contexts.
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Anthropic
Claude Sonnet 4, released by Anthropic in May 2025, is a large language model from the Claude 4 family that delivers a balance of performance and efficiency for coding, reasoning, and analytical tasks. It features a 200K token context window (extendable to 1M tokens in beta), 64K maximum output tokens, native image understanding, and extended thinking support. Sonnet 4 targets development workflows, document analysis, and applications that benefit from the performance characteristics of the Claude 4 generation.
8 months newer
Claude Sonnet 4
Anthropic
2025-05-14
Claude Opus 4.6
Anthropic
2026-02
Pricing Comparison
Cost per million tokens (USD)
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Claude Opus 4.6
Input:$5.00
Output:$25.00
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Claude Sonnet 4
Input:$3.00
Output:$15.00($12.00 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude Opus 4.6
Average Score:66.1%(+26.4%)
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Claude Sonnet 4
Average Score:39.8%
Performance comparison across key benchmark categories
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Claude Opus 4.6
Agents72.7%(+28.8%)
Tool Use59.5%(+23.9%)
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Claude Sonnet 4
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4
2025-01
Claude Opus 4.6
2025-05
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Claude Opus 4.6
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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Claude Sonnet 4
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Claude Opus 4.6
Avg Score:66.1%(+26.4%)
Providers:3
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Claude Sonnet 4
Avg Score:39.8%
Providers:3