GPT-5.3 Codex Spark
GPT-5.3 Codex Spark is an API-only (closed weights) language model from OpenAI, released February 5, 2026. The context window is 125K tokens. API price: $1.75 input / $14 output per million tokens.
Today, we’re releasing a research preview of GPT‑5.3‑Codex‑Spark, a smaller version of GPT‑5.3‑Codex, and our first model designed for real-time coding. Codex-Spark marks the first milestone in our partnership with Cerebras, which we announced in January.
Check it against your own PC →
Lab
OpenAI
Released
February 5, 2026
Weights
API-only (closed weights)
Parameters
–
Context
125K
Price / M tokens
$1.75 / $14 in / out
Epoch ECI
not yet rated
Benchmark results
Epoch AI has not published results for GPT-5.3 Codex Spark yet. New models are usually evaluated within days to weeks.
Links
More from OpenAI
GPT-6.1 Terra · GPT-6.1 Sol · GPT-6 Sol · GPT-6 Luna · GPT-6 Astra · GPT-5.6 Cyber · Daybreak Red · Daybreak Blue