GPT-5.3 Codex Spark
Coding-optimized GPT model for repository edits, reviews, and agentic software work
- Price per 1M tokens
- $1.75 / $14 input / output · OpenAI
- Context window
- 128K tokens in · 32K out
BENCHMARKS
Not in the Epoch Capabilities Index. Epoch benchmarks what it can run, so this is a gap in coverage, not a poor result.
OpenAI's past year
24 release days in the past year, about one every 15 days. The next is expected around Nov 8, 2026. Forecasts ↗
NovDecJanFebMarAprMayJunJulAugSepOctNov
Specifications
RELEASE DATEFeb 5, 2026
WEIGHTSClosed weights
CONTEXT WINDOW128K
MAX OUTPUT32K
REASONINGNot listed
TOOL CALLINGNot listed
INPUTStext, image/jpeg, image/png, image/gif, image/webp, application/pdf
OUTPUTStext
Specifications and prices from Models.dev; availability and limits may differ by provider. Benchmarks from Epoch AI (CC BY 4.0), LiveBench and the other sources named above.