Claude Opus 4.6 vs GPT-5.2 Codex
Claude Opus 4.6 and GPT-5.2 Codex are closely matched at 45.3 and 34.6 on the LLM Stats Score. GPT-5.2 Codex is 2.1x cheaper per token.
Anthropic · OpenAI · Updated for 2026
Which is better?
Claude Opus 4.6 and GPT-5.2 Codex are closely matched on the overall LLM Stats Score at 45.3 and 34.6.
In the 2 individual benchmarks reported for both models, Claude Opus 4.6 wins 2; this is a narrower head-to-head signal than the composite indexes.
On price, GPT-5.2 Codex is roughly 2.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude Opus 4.6 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 4.6
- you value its reported benchmark strengths — it wins 2 of 2 exact shared results
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Feb 2026
Choose GPT-5.2 Codex
- cost matters — it's about 2.1x cheaper per token
At a glance
The differences that matter most.
Individual benchmarks
27 reported for Claude Opus 4.6 · 3 for GPT-5.2 Codex
Claude Opus 4.6 outperforms in 2 benchmarks (LiveBench, Terminal-Bench 2.0), while GPT-5.2 Codex is better at 0 benchmarks.
Claude Opus 4.6 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 4.6 ($5.00/1M tokens) is 2.9x more expensive than GPT-5.2 Codex ($1.75/1M tokens).
For output processing, Claude Opus 4.6 ($25.00/1M tokens) is 1.8x more expensive than GPT-5.2 Codex ($14.00/1M tokens).
In conclusion, Claude Opus 4.6 is more expensive than GPT-5.2 Codex.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude Opus 4.6 accepts 1,000,000 input tokens compared to GPT-5.2 Codex's 400,000 tokens. Both models can generate responses up to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Opus 4.6 and GPT-5.2 Codex support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Opus 4.6
GPT-5.2 Codex
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 4.6 was released on 2026-02-05, while GPT-5.2 Codex was released on 2026-01-14.
Claude Opus 4.6 is 1 month newer than GPT-5.2 Codex.
Feb 5, 2026
6 months ago
3w newerJan 14, 2026
7 months 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 4.6 is available from Anthropic. GPT-5.2 Codex is available from OpenAI.
Claude Opus 4.6
GPT-5.2 Codex
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Opus 4.6 and GPT-5.2 Codex side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Opus 4.6 vs GPT-5.2 Codex.