GPT-4.1 vs GPT-5.1 Codex Mini
GPT-4.1 leads the LLM Stats Score 17.5 to -3.1. GPT-5.1 Codex Mini is 5.1x cheaper per token.
OpenAI · OpenAI · Updated for 2026
Which is better?
GPT-4.1 leads the overall LLM Stats Score 17.5 to -3.1, ranking #242 overall.
In the 1 individual benchmarks reported for both models, GPT-4.1 wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, GPT-5.1 Codex Mini is roughly 5.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-4.1 also accepts a larger context window (1,047,576 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 GPT-4.1
- overall performance matters — it scores 17.5 and ranks #242 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- you process long inputs — it offers a 1,047,576 token context window
Choose GPT-5.1 Codex Mini
- cost matters — it's about 5.1x cheaper per token
- you want the most recent training data — it shipped Nov 2025
At a glance
The differences that matter most.
Individual benchmarks
29 reported for GPT-4.1 · 1 for GPT-5.1 Codex Mini
GPT-4.1 outperforms in 1 benchmarks (AIME 2025), while GPT-5.1 Codex Mini is better at 0 benchmarks.
GPT-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, GPT-4.1 ($2.00/1M tokens) is 8.0x more expensive than GPT-5.1 Codex Mini ($0.25/1M tokens).
For output processing, GPT-4.1 ($8.00/1M tokens) is 4.0x more expensive than GPT-5.1 Codex Mini ($2.00/1M tokens).
In conclusion, GPT-4.1 is more expensive than GPT-5.1 Codex Mini.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-4.1 accepts 1,047,576 input tokens compared to GPT-5.1 Codex Mini's 400,000 tokens. GPT-5.1 Codex Mini can generate longer responses up to 128,000 tokens, while GPT-4.1 is limited to 32,768 tokens.
Input capabilities
Documented input modalities across available providers
Both GPT-4.1 and GPT-5.1 Codex Mini support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-4.1
GPT-5.1 Codex 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
GPT-4.1 was released on 2025-04-14, while GPT-5.1 Codex Mini was released on 2025-11-12.
GPT-5.1 Codex Mini is 7 months newer than GPT-4.1.
Apr 14, 2025
1.5 years ago
Nov 12, 2025
11 months ago
7mo newerKnowledge Cutoff
When training data ends
GPT-4.1 has a documented knowledge cutoff of 2024-06-01, while GPT-5.1 Codex Mini's cutoff date is not specified.
We can confirm GPT-4.1's training data extends to 2024-06-01, but cannot make a direct comparison without GPT-5.1 Codex Mini's cutoff date.
Jun 2024
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Provider Availability
GPT-4.1 is available from OpenAI. GPT-5.1 Codex Mini is available from OpenAI.
GPT-4.1
GPT-5.1 Codex Mini
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-4.1 and GPT-5.1 Codex Mini side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-4.1 vs GPT-5.1 Codex Mini.