Claude Opus 4.1 vs Claude Sonnet 4.5 (Comparative Analysis)
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Comparative Analysis: Claude Opus 4.1 vs. Claude Sonnet 4.5
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Overview
Claude Opus 4.1 was released 1 month before Claude Sonnet 4.5.
 Claude Opus 4.1 | Claude Sonnet 4.5 | |
|---|---|---|
Model Provider The organization behind this AI's development | Anthropic | Anthropic |
Input Context Window Maximum input tokens this model can process at once | 200K tokens | 1M tokens |
Output Token Limit Maximum output tokens this model can generate at once | 32K tokens | 64K tokens |
Release Date When this model first became publicly available | August 5, 2025 1 year ago August 5th, 2025 | September 29, 2025 10 months ago September 29th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | January 31, 2025 | January 31, 2025 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Claude Opus 4.1 | Claude Sonnet 4.5 | |
|---|---|---|
Input Types Supported input formats | 🖼️Image📝Text📁File | 📝Text🖼️Image📁File |
Reasoning Controls Defaults and configurable reasoning effort | Optional | Optional |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Claude | Claude |
Key Features Advanced capabilities | ✓Function CallingStructured Output✓Reasoning Mode✓Content Moderation | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation |
Pricing
Claude Opus 4.1 is roughly 5.0x more expensive compared to Claude Sonnet 4.5 for input tokens and roughly 5.0x more expensive for output tokens.
| Claude Opus 4.1 | Claude Sonnet 4.5 | |
|---|---|---|
Short Context Pricing Base rates before a long-context threshold applies | ||
Input Token Cost Cost per million input tokens | $15.00 per million tokens | $3.00 per million tokens |
Output Token Cost Cost per million output tokens | $75.00 per million tokens | $15.00 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.01 per search | $0.01 per search |
Cache Read Cost Cost to reuse cached input tokens | $1.50 per million tokens | $0.30 per million tokens |
Cache Write Cost Cost to write input tokens to the cache | $18.75 per million tokens | $3.75 per million tokens |
1-Hour Cache Write Cost Cost to cache input tokens for one hour | $30.00 per million tokens | $6.00 per million tokens |
Long Context Pricing Rates for prompts with 200,000 or more tokens | ||
Input Token Cost Long-context input cost per million tokens | Not specified | $6.00 per million tokens |
Output Token Cost Long-context output cost per million tokens | Not specified | $22.50 per million tokens |
Cache Read Cost Long-context cache read cost per million tokens | Not specified | $0.60 per million tokens |
Cache Write Cost Long-context cache write cost per million tokens | Not specified | $7.50 per million tokens |
Benchmarks
Compare relevant benchmarks between Claude Opus 4.1 and Claude Sonnet 4.5.
| Claude Opus 4.1 | Claude Sonnet 4.5 | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | Benchmark not available. | 37.4 (Artificial Analysis index; higher is better) |
Coding Index Programming performance across independent evaluations | Benchmark not available. | 52.1 (Artificial Analysis index; higher is better) |
Agentic Index Ability to complete multi-step agentic tasks | Benchmark not available. | 26.4 (Artificial Analysis index; higher is better) |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,211 Elo (#43 in Game Dev (58.5% win rate)) | 1,242 Elo (#15 in Asciiart (56.1% win rate)) |
At a Glance
Quick overview of what makes Claude Opus 4.1 and Claude Sonnet 4.5 unique.
Claude Opus 4.1 by Anthropic understands both text and images, can use external tools and APIs, offers advanced reasoning. It can handle standard conversations with its 200K token context window. Premium pricing at $15.00/M input and $75.00/M output tokens. Includes built-in content moderation for safer outputs. Released August 5th, 2025.Claude Sonnet 4.5 by Anthropic understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Premium pricing at $3.00/M input and $15.00/M output tokens. Includes built-in content moderation for safer outputs. Released September 29th, 2025.Explore More Comparisons
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Compare Claude Sonnet 4.5 with:
🚀Programming
Best models for coding and development
🎨Creative & Roleplay
Models optimized for creative writing
📢Marketing
Content creation and marketing tasks
💻Technology
Technical analysis and explanations
🔬Science
Scientific research and analysis
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