Claude Opus 5.5 vs o1-mini
Claude Opus 5.5 leads the LLM Stats Score 59.7 to 10.0. o1-mini is 1.5x cheaper per token.
Anthropic · OpenAI · Updated for 2026
Which is better?
Claude Opus 5.5 leads the overall LLM Stats Score 59.7 to 10.0, ranking #1 overall.
On price, o1-mini is roughly 1.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude Opus 5.5 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude Opus 5.5
- overall performance matters — it scores 59.7 and ranks #1 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Sep 2026
Choose o1-mini
- cost matters — it's about 1.5x cheaper per token
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
31 reported for Claude Opus 5.5 · 6 for o1-mini
Claude Opus 5.5 and o1-minidon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Opus 5.5 ($4.00/1M tokens) is 1.3x more expensive than o1-mini ($3.00/1M tokens).
For output processing, Claude Opus 5.5 ($20.00/1M tokens) is 1.7x more expensive than o1-mini ($12.00/1M tokens).
In conclusion, Claude Opus 5.5 is more expensive than o1-mini.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude Opus 5.5 accepts 1,000,000 input tokens compared to o1-mini's 128,000 tokens. Claude Opus 5.5 can generate longer responses up to 128,000 tokens, while o1-mini is limited to 65,536 tokens.
Input capabilities
Documented input modalities across available providers
Claude Opus 5.5 supports multimodal inputs, whereas o1-mini does not.
Claude Opus 5.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude Opus 5.5
o1-mini
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude Opus 5.5 was released on 2026-09-22, while o1-mini was released on 2024-09-12.
Claude Opus 5.5 is 25 months newer than o1-mini.
Sep 22, 2026
0 days ago
2.0yr newerSep 12, 2024
2.0 years ago
Knowledge Cutoff
When training data ends
Claude Opus 5.5 has a documented knowledge cutoff of 2026-06-01, while o1-mini's cutoff date is not specified.
We can confirm Claude Opus 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without o1-mini's cutoff date.
Jun 2026
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Provider Availability
Claude Opus 5.5 is available from Anthropic. o1-mini is available from OpenAI, Azure.
Claude Opus 5.5
o1-mini
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Opus 5.5 and o1-mini side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Opus 5.5 vs o1-mini.