OpenAI: GPT-5.3-Codex
openai/gpt-5.3-codex
31st smartest of 182ReasoningToolsJSONVision
Intelligence
44.3
31st of 182
Design Elo
1192
Data Viz
Speed
—
tokens/sec
Latency
—
first token
Input price
$1.75
261st cheapest
Context
400K
128K max out
How it compares
Smarter than83%
of all ranked models
Cheaper than21%
of all ranked models
Overview
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
Benchmarks
independent · Artificial Analysis & Design ArenaArtificial Analysis94th percentile
Intelligence Index
44.3
GPQA Diamond
92%
Humanity's Last Exam
40%
SciCode
53%
Tau²-Bench (agentic)
86%
Design Arena · Elo717 tournaments
Data Viz
1192
Website
1187
svg
1177
3D
1065
Providers & pricing (3)
| Provider | In $/M | Out $/M | Context | Uptime |
|---|---|---|---|---|
| OpenAI | $1.75 | $14.00 | 400K | 99.8% |
| OpenAI | $3.50 | $28.00 | 400K | 99.8% |
| Azure | $1.75 | $14.00 | 400K | 100% |
Specifications
Context window400K
Max output128K
Knowledge cutoff—
Input modalitiestext, image, file
Output modalitiestext
Prompt caching—
Cache read price$0.175/M
ModeratedYes
GPT-5.3-Codex FAQ
How much does GPT-5.3-Codex cost?
GPT-5.3-Codex costs $1.75 per million input tokens and $14.00 per million output tokens via OpenRouter, making it 261st cheapest of 332 paid models.
How smart is GPT-5.3-Codex?
GPT-5.3-Codex scores 44.3 on the Artificial Analysis Intelligence Index, ranking 31st of 182 benchmarked models, with a GPQA Diamond score of 92%.
What is GPT-5.3-Codex's context window?
GPT-5.3-Codex supports a 400K-token context window and can output up to 128K tokens. It accepts text, image, file input.