Claude Sonnet 4.5 vs o3 Mini High (Comparative Analysis)
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Comparative Analysis: Claude Sonnet 4.5 vs. o3 Mini High
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Overview
o3 Mini High was released 7 months before Claude Sonnet 4.5.
 Claude Sonnet 4.5 |  o3 Mini High | |
|---|---|---|
Model Provider The organization behind this AI's development | Anthropic | OpenAI |
Input Context Window Maximum input tokens this model can process at once | 1M tokens | 200K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 64K tokens | 100K tokens |
Release Date When this model first became publicly available | September 29, 2025 9 months ago September 29th, 2025 | February 12, 2025 1 year ago February 12th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | January 31, 2025 | October 31, 2023 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Claude Sonnet 4.5 | o3 Mini High | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image📁File | 📝Text📁File |
Reasoning Controls Defaults and configurable reasoning effort | Optional | Always enabledEffort: HighDefault: High |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Claude | GPT |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation |
Pricing
Claude Sonnet 4.5 is roughly 2.7x more expensive compared to o3 Mini High for input tokens and roughly 3.4x more expensive for output tokens.
| Claude Sonnet 4.5 | o3 Mini High | |
|---|---|---|
Short Context Pricing Base rates before a long-context threshold applies | ||
Input Token Cost Cost per million input tokens | $3.00 per million tokens | $1.10 per million tokens |
Output Token Cost Cost per million output tokens | $15.00 per million tokens | $4.40 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 | $0.30 per million tokens | $0.55 per million tokens |
Cache Write Cost Cost to write input tokens to the cache | $3.75 per million tokens | Not specified |
1-Hour Cache Write Cost Cost to cache input tokens for one hour | $6.00 per million tokens | Not specified |
Long Context Pricing Rates for prompts with 200,000 or more tokens | ||
Input Token Cost Long-context input cost per million tokens | $6.00 per million tokens | Not specified |
Output Token Cost Long-context output cost per million tokens | $22.50 per million tokens | Not specified |
Cache Read Cost Long-context cache read cost per million tokens | $0.60 per million tokens | Not specified |
Cache Write Cost Long-context cache write cost per million tokens | $7.50 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between Claude Sonnet 4.5 and o3 Mini High.
| Claude Sonnet 4.5 | o3 Mini High | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | 36.4 (Artificial Analysis index; higher is better) | 15.6 (Artificial Analysis index; higher is better) |
Coding Index Programming performance across independent evaluations | 52.1 (Artificial Analysis index; higher is better) | 16.3 (Artificial Analysis index; higher is better) |
Agentic Index Ability to complete multi-step agentic tasks | 24.6 (Artificial Analysis index; higher is better) | 1.7 (Artificial Analysis index; higher is better) |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,244 Elo (#10 in Asciiart (56.2% win rate)) | Benchmark not available. |
At a Glance
Quick overview of what makes Claude Sonnet 4.5 and o3 Mini High unique.
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.o3 Mini High by OpenAI can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 200K token context window. Reasonably priced at $1.10/M input and $4.40/M output tokens. Includes built-in content moderation for safer outputs. Released February 12th, 2025.Explore More Comparisons
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Compare o3 Mini High 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
🌐Translation
Multilingual translation tasks