Claude Opus 4.1 vs Claude Opus 4
Claude Opus 4.1 and Claude Opus 4 are closely matched at 29.5 and 27.4 on the LLM Stats Score. Claude Opus 4.1 and Claude Opus 4 cost the same.
Anthropic · Anthropic · Updated for 2026
Which is better?
Claude Opus 4.1 and Claude Opus 4 are closely matched on the overall LLM Stats Score at 29.5 and 27.4.
In the 8 individual benchmarks reported for both models, Claude Opus 4.1 wins 7; this is a narrower head-to-head signal than the composite indexes.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude Opus 4.1
- you value its reported benchmark strengths — it wins 7 of 8 exact shared results
- you want the most recent training data — it shipped Aug 2025
Choose Claude Opus 4
- you want predictable pricing at $15.00/M input and $75.00/M output
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
8 reported for Claude Opus 4.1 · 9 for Claude Opus 4
Claude Opus 4.1 outperforms in 7 benchmarks (AIME 2025, GPQA, MMMLU, MMMU (validation), SWE-Bench Verified, TAU-bench Retail, Terminal-Bench), while Claude Opus 4 is better at 1 benchmark (TAU-bench Airline).
Claude Opus 4.1 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Opus 4.1 ($15.00/1M tokens) costs the same as Claude Opus 4 ($15.00/1M tokens).
For output processing, Claude Opus 4.1 ($75.00/1M tokens) costs the same as Claude Opus 4 ($75.00/1M tokens).
In conclusion, Claude Opus 4.1 and Claude Opus 4 cost the same.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 200,000 tokens. Both models can generate responses up to 32,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Opus 4.1 and Claude Opus 4 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Opus 4.1
Claude Opus 4
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 4.1 was released on 2025-08-05, while Claude Opus 4 was released on 2025-05-22.
Claude Opus 4.1 is 3 months newer than Claude Opus 4.
Aug 5, 2025
1.2 years ago
2mo newerMay 22, 2025
1.4 years ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude Opus 4.1 is available from Anthropic, Bedrock, Google. Claude Opus 4 is available from Anthropic, Bedrock, Google.
Claude Opus 4.1
Claude Opus 4
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Opus 4.1 and Claude Opus 4 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Opus 4.1 vs Claude Opus 4.