OpenAI · Released Feb 5, 2026GPT-5.3 Codex Spark
Coding-optimized GPT model for repository edits, reviews, and agentic software work.
- Capability
- —No ECI score yet
- Input
- $1.75per 1M tokens
- Output
- $14.00per 1M tokens
- Context
- 128K32K max output
What it costs
- Input
- $1.75per million tokens
- Output
- $14.00per million tokens
- Cached input
- $0.175per million tokens
- Blended (3:1)
- $4.81pricier than 87% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $10.50 |
| Team assistant25M input + 5M output tokens | $113.75 |
| Production app250M input + 50M output tokens | $1,138 |
Official OpenAI API price, as listed on models.dev.
Independent benchmarks
Epoch AI has not published a Capabilities Index score for GPT-5.3 Codex Spark yet.
The details
- Lab
- OpenAI
- Released
- Feb 5, 2026
- Knowledge cutoff
- Aug 31, 2025
- Context window
- 128,000 tokens
- Max output
- 32,000 tokens
- Inputs
- Text, Images, PDFs
- Output
- Text
- Reasoning
- Adjustable effort low · medium · high · xhigh
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Proprietary
- API model ID
gpt-5.3-codex-sparkon OpenAI- Availability
- 1 API providerlisted on models.dev
More from OpenAI
About GPT-5.3 Codex Spark
How much does GPT-5.3 Codex Spark cost?
GPT-5.3 Codex Spark costs $1.75 input / $14.00 output per million tokens (official OpenAI API price). Cached input is $0.175 per million tokens. At a 3:1 input-to-output mix that is $4.81 per million tokens, more expensive than 87% of the 360 priced models we track.
What is the context window of GPT-5.3 Codex Spark?
GPT-5.3 Codex Spark accepts up to 128,000 tokens per request and can write up to 32,000 tokens in one response.
How good is GPT-5.3 Codex Spark?
Epoch AI has not published a Capabilities Index score for GPT-5.3 Codex Spark yet.
Is GPT-5.3 Codex Spark open source?
No. GPT-5.3 Codex Spark is proprietary; you use it through OpenAI’s API or partner platforms.
What inputs does GPT-5.3 Codex Spark support?
GPT-5.3 Codex Spark accepts text, images and PDFs and replies in text. It is a reasoning model with low, medium, high and xhigh effort settings, supports tool calling and can return structured JSON output.
When was GPT-5.3 Codex Spark released?
OpenAI released GPT-5.3 Codex Spark on Feb 5, 2026. Its training data runs to Aug 31, 2025.
What are the best alternatives to GPT-5.3 Codex Spark?
The closest current models from other labs on capability, price and release date are Command A Plus (Cohere, $2.50 / $10.00), Gemini 2.5 Computer Use Preview (Google, $1.25 / $10.00), Kimi K2.7 Code Highspeed (Moonshot AI, $1.90 / $8.00) and MiMo-V2.6-Pro-UltraSpeed (Xiaomi, $4.35 / $8.70).