Models / OpenAI
GPT-5.3-Codex
by OpenAI ·
openai/gpt-5.3-codexGPT-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...
reasoningtool-usevisionreleased 2026-02-24
Legal score · raw
-
not yet benchmarked
Context
400K
max output 128K
Input
$2.19
per 1M tokens
Output
$17.50
per 1M tokens
Suite cost
-
no run recorded
Prompt caching
Grounded answers re-send the same retrieved authority every turn, so a cached read is what a long matter actually costs. Prices are per 1M tokens, from the provider’s own catalog.
Cache read
$0.22
10x cheaper than uncached
Uncached input
$2.19
per 1M tokens
Capabilities
Modalities
in textimagefile
out text
Request parameters it accepts
include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetoolsverbosity
Benchmark results
This model has not been run through the suite yet. See Humanity's Last Lawsuit for the benchmark models are ranked on.