Serenities AI™
OpenAI

GPT-5.1 Codex Mini — Benchmark Scores, Pricing & Performance Analysis

MIDOpenAI
Chatbot Arena ELO
1310
Output Speed
170 tok/s
Input Cost
$0.25/1M
Output Cost
$2.0/1M
Context Window
400K

GPT-5.1 Codex Mini by OpenAI demonstrates strong general intelligence, solid coding performance, fast output speed, competitive pricing. View detailed benchmark data including scores across coding, math, reasoning, speed, and cost metrics.

Math Benchmarks

MATH
78.0%
Papers
GSM8K
92.0%
Papers

Reasoning Benchmarks

GPQA Diamond
52.0%
Papers
ARC-AGI
35.0%
arcprize.org

Context Benchmarks

Context Length
400K
OpenRouter API

GPT-5.1 Codex Mini — Benchmark Scores Overview

Scores normalized to percentage scale for visual comparison. ELO scores mapped to 0-100 range (1100-1500).

Compare GPT-5.1 Codex Mini With

GPT-5.1 Codex Mini vs GPT-5.2GPT-5.1 Codex Mini vs Claude Opus 4.6GPT-5.1 Codex Mini vs Gemini 3.1 ProGPT-5.1 Codex Mini vs DeepSeek R1 0528GPT-5.1 Codex Mini vs Grok 4

GPT-5.1 Codex Mini — Frequently Asked Questions

How intelligent is GPT-5.1 Codex Mini?

GPT-5.1 Codex Mini scores 1310 on the Chatbot Arena ELO rating, making it a mid-tier AI model. This score is based on blind head-to-head human preference voting.

How much does GPT-5.1 Codex Mini cost?

GPT-5.1 Codex Mini costs $0.25 per 1M input tokens and $2.0 per 1M output tokens. This makes it one of the more affordable models.

How fast is GPT-5.1 Codex Mini?

GPT-5.1 Codex Mini generates output at 170 tokens per second, which is very fast compared to other models. The time to first token is 180 ms.

How good is GPT-5.1 Codex Mini at coding?

GPT-5.1 Codex Mini achieves 55.0% on SWE-bench Verified, demonstrating strong real-world software engineering capability. This benchmark tests the model's ability to resolve actual GitHub issues.

How good is GPT-5.1 Codex Mini at math and reasoning?

GPT-5.1 Codex Mini scores 78.0% on the MATH benchmark (competition-level mathematics). It also achieves 52.0% on GPQA Diamond, a graduate-level science reasoning benchmark.

What is the context window of GPT-5.1 Codex Mini?

GPT-5.1 Codex Mini has a context window of 400K tokens. This determines how much text, conversation history, and code the model can process in a single request.

Who created GPT-5.1 Codex Mini?

GPT-5.1 Codex Mini was created by OpenAI. It is classified as a mid model in the AI Value Index.

Is GPT-5.1 Codex Mini open source?

No, GPT-5.1 Codex Mini is a proprietary model. It is available through OpenAI's API and compatible providers.

Back to AI Value Index