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 Opus 4.5AnthropicReleased November 1, 2025
Claude Opus 4.5
A major architectural refinement reducing Opus pricing by 66% while increasing context to 500,000 tokens.
reasoning-llmProprietary API$5.00 / 1M tok (Opus 4.5)Context: 500K (500,000 tokens)Arena ELO: 1460
Technical Specifications
Architecture Type
Frontier Agentic Transformer
Total Parameters
Frontier Scale
Context Window
500K (500,000 tokens)
Max Output Tokens
64K (64,000 tokens)
Knowledge Cutoff
September 2025
Supported Modalities
text, code, vision, reasoning
License & Access
Anthropic Commercial Terms
Benchmark Evaluations
Math500
98.4
Mmlu Pro
86.8
Gpqa Diamond
80.4
Swe Bench Verified
78.9
Chatbot Arena ELO
1460
Deep Architectural Overview
Claude Opus 4.5 slashed pricing from $15/$75 down to $5/$25 per million tokens while outperforming prior Opus versions across every metric. It unlocked economical large-scale agent deployments with 500k context.
Strengths & Considerations
Core Strengths
- 66% price drop ($5/$25) for top-tier Opus intelligence
- 500k context window for massive multi-document analysis
- 78.9% SWE-bench Verified coding score
Known Limitations
- Active support through November 2026; succeeded by Claude Opus 5
Token & API Pricing
Input Tokens (1M)$5.00
Output Tokens (1M)$25.00
Cached Input (1M)$0.5000
Batch API Discount50% Off Standard
Pricing is verified directly against Anthropic's developer documentation and API rate sheets.
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