GPT-5.3 Codex
by OpenAIChatretires 2027-04-01
Coding-optimized GPT model for repository edits, reviews, and agentic software work
- Context
- 400K tokens
- Max output
- 128,000 tokens
- Released
- 2026-02-05
- Weights
- Closed
openai/gpt-5-3-codex · also seen as openai-gpt-53-codex, openai/gpt-5.3-codex-fast, azure/gpt-5.3-codex, databricks-gpt-5-3-codex, +3 more
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2026-02-05
- Weights
- Closed
- Input
- Text, Image, PDF
- Output
- Text
- Context window
- 400,000 max across endpoints
- Max output
- 128,000
- Providers
- 13 + 22 gateways, not counted as providers
- Epoch Capabilities Index
- 156.8 ± 3.8 against price
- Direct price range
- $1.75–$4.81 in · $14.00–$38.51 out per 1M tokens · 11 of 13 providers have a comparable price
More details
- Last updated
- 2026-06-11
- Knowledge cutoff
- 2025-08-31
- Developer country
- United States of America
Capabilities
Across all endpoints: supported if any endpoint supports it.
- Tool calling
- Parallel tools
- Structured output
- Reasoning
- Image input
- PDF input
- Audio input
- Audio outputunknown
- Video input
- Prompt caching
- Web search
- Computer useunknown
- System messages
- Assistant prefillunknown
- Temperature
- Streaming
- Attachments
Endpoints
One row per provider and variant; gateways are listed separately.
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Price history
Atom feedNo change since 19 Oct 2026. The cheapest direct price has been $1.75 in / $14 out per 1M tokens at OpenAI on every data refresh since then.
Tracked from 19 Oct 2026. Headline-eligible direct prices only, so a price the sanity check flags never draws a spike. Series as JSON
Cost calculator
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Similarly priced models
Blended rate per 1M tokens, each at its own cheapest provider (10M input : 2M output mix).
| Model | Blended/1M | In/1M | Out/1M | Context | vs GPT-5.3 Codex |
|---|---|---|---|---|---|
| GPT-5.2 ChatOpenAI | $3.79 | $1.75 | $14 | 128K | +0% |
| GPT-5.2 CodexOpenAI | $3.79 | $1.75 | $14 | 400K | +0% |
| GPT-5.3 ChatOpenAI | $3.79 | $1.75 | $14 | 128K | +0% |
| GPT-5.3 Codex SparkOpenAI | $3.79 | $1.75 | $14 | 128K | +0% |
| GLM 5.3 PrimeZ.ai (Zhipu AI) | $3.80 | $2.80 | $8.80 | 1M | +0% |
| Command ACohere | $3.75 | $2.50 | $10 | 256K | −1% cheaper |
| Command A PlusCohere | $3.75 | $2.50 | $10 | 128K | −1% cheaper |
| Command A ReasoningCohere | $3.75 | $2.50 | $10 | 256K | −1% cheaper |
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