Anthropic
Anthropic Claude model for long-running agentic coding and knowledge work.
1M ctxUSD 4 / 1M input tok; USD 20 / 1M output tok
Introducing Claude Sonnet 5AnthropicReleased June 30, 2026
Claude Sonnet 5
Anthropic’s fifth-generation workhorse, combining 1M context with adaptive thinking on by default at a lower $2/$10 price point.
reasoning-llmProprietary API$2.00 / 1M tok (1M Context Sonnet 5)Context: 1M (1,000,000 tokens)Arena ELO: 1510
Technical Specifications
Architecture Type
Fifth-Generation Adaptive Reasoning Transformer
Total Parameters
Fifth-Gen Scale
Context Window
1M (1,000,000 tokens)
Max Output Tokens
128K (128,000 tokens)
Knowledge Cutoff
January 2026
Supported Modalities
text, code, vision, reasoning
License & Access
Anthropic Commercial Terms
Benchmark Evaluations
Math500
98.6
Mmlu Pro
89.6
Gpqa Diamond
82.5
Swe Bench Verified
82
Chatbot Arena ELO
1510
Deep Architectural Overview
Claude Sonnet 5 introduces Anthropic’s new high-density tokenizer and adaptive thinking. With 1M context, 128k output buffer, and a price cut to $2/$10 per million tokens ($0.20 cache read), it represents the optimal balance of speed, intelligence, and economics.
Strengths & Considerations
Core Strengths
- 33% cheaper than Sonnet 4 ($2/$10 per 1M tokens)
- 1,000,000 token context window and 128k output buffer
- Adaptive thinking enabled by default
- 82.0% SWE-bench Verified coding score
Known Limitations
- Manual temperature/top_p overrides return 400 errors (requires prompt steering)
Token & API Pricing
Input Tokens (1M)$2.00
Output Tokens (1M)$10.00
Cached Input (1M)$0.2000
Batch API Discount50% Off Standard
Pricing is verified directly against Anthropic's developer documentation and API rate sheets.
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