GPT-5.3-Codex
by OpenAItext+image+file->text3 endpoints
Neura Intelligence Index
48.8/ 100
Rank
#182—
Confidence
lowBenchmarks
1(3% coverage)
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...
Capabilities
Text generation
Image understanding
Tool use / Function calling
Structured output
Extended reasoning
Prompt caching
Long context
File input
Deterministic seed
Modalities
Input
TextImageFile
Output
Text
Technical Specifications
Context Window
400K tokens
Max Output
128K tokens
Tokenizer
GPT
Content Moderation
Enabled
Uptime (24h)
10000.0%
Country
🇺🇸US
Release Date
February 5, 20267mo
Supported Parameters
include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools
Performance Over Time
Pricing
Per 1M tokens
Input$1.75
Output$14.00
Cache read$0.17
Added
February 24, 2026
Last synced 9/20/2026