ModelBench
OpenAI logo
Models/OpenAI

GPT-5.1 Codex mini

Coding-optimized GPT model for repository edits, reviews, and agentic software work

Source-linked gpt-codex Closed weights Released 2025-11-13
API data Report
Input modalitiesT
Output modalitiesT
Input price$0.22/1M tokens
Output price$1.8/1M tokens
Context window400K
Max output128K
Overview

Capabilities and specifications

✓ Reasoning Yes
✓ Tool calling Yes
? Structured output Unknown
✓ Attachments Yes
✓ Vision input Yes
× Open weights No
Creator
OpenAI
Model family
gpt-codex
Knowledge cutoff
2024-09-30
License
Not documented
Release date
2025-11-13
Model ID
openai/gpt-5.1-codex-mini
Inference availability

Provider pricing and availability

Provider-specific identifiers, limits, and prices per million tokens.

Report a price
Providers offering GPT-5.1 Codex mini
ProviderProvider model IDContextInputOutputCache readCapabilitiesSource
Poe openai/gpt-5.1-codex-mini 400K $0.22 $1.8 $0.022 ReasoningTools Docs
Requesty openai/gpt-5.1-codex-mini 400K $0.25 $2 $0.025 ReasoningToolsJSON Docs
Vercel AI Gateway openai/gpt-5.1-codex-mini 400K $0.25 $2 $0.03 ReasoningToolsJSON Docs
ZenMux openai/gpt-5.1-codex-mini 400K $0.25 $2 $0.03 ReasoningTools Docs
OpenAI gpt-5.1-codex-mini 400K $0.25 $2 $0.025 ReasoningToolsJSON Docs
OrcaRouter openai/gpt-5.1-codex-mini 400K $0.25 $2 $0.025 ReasoningToolsJSON Docs
LLM Gateway gpt-5.1-codex-mini 400K $0.25 $2 $0.025 ReasoningToolsJSON Docs
Kilo Gateway openai/gpt-5.1-codex-mini 400K $0.25 $2 $0.025 ReasoningTools Docs
OpenRouter openai/gpt-5.1-codex-mini 400K $0.25 $2 $0.03 ReasoningToolsJSON Docs
AIHubMix gpt-5.1-codex-mini 400K $0.25 $2 $0.025 ReasoningToolsJSON Docs
NanoGPT openai/gpt-5.1-codex-mini 400K $0.25 $2 - Reasoning Docs
Neon gpt-5-1-codex-mini 400K $0.25 $2 $0.025 ReasoningToolsJSON Docs

Capability badges appear only when the provider catalog explicitly lists support.

Serving quality

Performance and reliability

Observed serving measurements stay separate from model specifications and are never estimated from price or model size.

Throughput Not reported

Generation speed; higher is faster.

Latency / TTFT Not reported

Time until the first output token arrives.

Uptime Not reported

Successful requests over a measured period.

Performance varies by inference provider, region, and load. Provider-level measurements appear only when a source reports them.

Published evaluations

Benchmarks

Raw results remain attached to their original source and version.

Benchmark registry
Design Arena: 3d - Unversioned - eloTop 8 reported models
Kimi K3
1456.0
Claude Opus 5
1384.0
Anthropic: Claude Fable 5 (batch)
1373.0
Claude Fable 5
1373.0
Z.ai: GLM 5.2
1366.0
Z.ai: GLM 5.1
1336.0
Anthropic: Claude Opus 4.6 (batch)
1332.0
GPT-5.1 Codex mini
1045.0
Design Arena: asciiart - Unversioned - eloTop 8 reported models
Anthropic: Claude Fable 5 (batch)
1364.0
Claude Fable 5
1364.0
Anthropic: Claude Opus 4.7 (batch)
1324.0
Anthropic: Claude Opus 4.7
1324.0
Muse Spark 1.1
1322.0
Google: Gemini 3.1 Pro Preview (batch)
1309.0
Gemini 3.1 Pro Preview
1309.0
GPT-5.1 Codex mini
1142.0
Design Arena: codecategories - Unversioned - eloTop 8 reported models
Kimi K3
1418.0
Claude Opus 5
1358.0
Z.ai: GLM 5.2
1346.0
Anthropic: Claude Fable 5 (batch)
1340.0
Claude Fable 5
1340.0
Anthropic: Claude Opus 4.6 (batch)
1324.0
Anthropic: Claude Opus 4.6
1324.0
GPT-5.1 Codex mini
1124.0
Design Arena: dataviz - Unversioned - eloTop 8 reported models
Kimi K3
1382.0
Claude Opus 5
1378.0
Z.ai: GLM 5.1
1366.0
Google: Gemini 3.6 Flash (batch)
1350.0
Gemini 3.6 Flash
1350.0
Anthropic: Claude Fable 5 (batch)
1349.0
Claude Fable 5
1349.0
GPT-5.1 Codex mini
1126.0
Design Arena: gamedev - Unversioned - eloTop 8 reported models
Anthropic: Claude Fable 5 (batch)
1393.0
Claude Fable 5
1393.0
Z.ai: GLM 5.2
1358.0
Anthropic: Claude Sonnet 5 (batch)
1352.0
Claude Sonnet 5
1352.0
OpenAI: GPT-5.5 (batch)
1345.0
GPT-5.5
1345.0
GPT-5.1 Codex mini
1149.0
Design Arena: svg - Unversioned - eloTop 8 reported models
Anthropic: Claude Fable 5 (batch)
1351.0
Claude Fable 5
1351.0
Google: Gemini 3.1 Pro Preview (batch)
1335.0
Gemini 3.1 Pro Preview
1335.0
Google: Gemini 3.5 Flash (batch)
1296.0
Gemini 3.5 Flash
1296.0
Anthropic: Claude Opus 4.6 (batch)
1276.0
GPT-5.1 Codex mini
1026.0
Design Arena: uicomponent - Unversioned - eloTop 8 reported models
Kimi K3
1413.0
Claude Opus 5
1406.0
Anthropic: Claude Fable 5 (batch)
1350.0
Claude Fable 5
1350.0
Anthropic: Claude Opus 4.7 (batch)
1339.0
Anthropic: Claude Opus 4.7
1339.0
Z.ai: GLM 5.2
1334.0
GPT-5.1 Codex mini
1116.0
Design Arena: website - Unversioned - eloTop 8 reported models
Kimi K3
1375.0
Claude Opus 5
1343.0
Z.ai: GLM 5.2
1340.0
Anthropic: Claude Fable 5 (batch)
1323.0
Claude Fable 5
1323.0
xAI: Grok 4.5
1323.0
Google: Gemini 3.6 Flash (batch)
1322.0
GPT-5.1 Codex mini
1135.0
Catalog activity

Recent record changes

Detected changes from successful source imports.

Full change log
Price Completion2.0 → 1.8
Price Prompt0.25 → 0.22
Price Completion1.8 → 2.0
Price Prompt0.22 → 0.25
Price Completion2.0 → 1.8
Price Prompt0.25 → 0.22
Price Completion1.8 → 2.0
Price Prompt0.22 → 0.25
Public API

Use this record

Fetch the complete source-linked model record without an API key.

API documentation
Endpoint
GET https://www.modelbench.lol/api/v1/models/openai/gpt-5.1-codex-mini
curl
curl "https://www.modelbench.lol/api/v1/models/openai/gpt-5.1-codex-mini"