Model specification · OpenAI
GPT-5.3-Codex
openai/gpt-5.3-codex
GPT-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...
SpecificationsReported values
- Context window
- 400K
- Maximum output
- 128K
- Architecture
- text+image+file->text
- Tokenizer
- GPT
- Knowledge cutoff
- —
- Moderated
- Yes
- Input modalities
- textimagefile
- Output modalities
- text
Full pricingUSD where reported
| Price | Standard |
|---|---|
| Input | $1.75 / M |
| Output | $14.00 / M |
Benchmark indexesReported indexes
- Intelligence
- 32.5
- Coding
- —
- Agentic
- —
- Design Arena Elo
- 1103
Example workload costsStandard pricing only
| Workload | Input / output | Cache share | Estimated cost |
|---|---|---|---|
| Quick check | 10K / 1K × 1 | 0% | $0.032 |
| Long analysis | 100K / 4K × 1 | 50% | $0.152 |
| Workday | 20K / 2K × 1,000 | 30% | $53.55 |
More from OpenAIAll OpenAI models
| Model | Context | Input / M | Output / M | Intel. |
|---|---|---|---|---|
| GPT-6 Astra | 1.1M | $10.00 | $50.00 | 52.7 |
| GPT-6.1 Sol | 1.1M | $2.00 | $10.00 | 51.8 |
| GPT-6 Sol | 1.1M | $2.00 | $10.00 | 47.6 |
| GPT-5.6 Sol | 1.1M | $4.00 | $20.00 | 47 |
| GPT-5.6 Terra | 1.1M | $2.00 | $12.00 | 42.1 |
| GPT-5.4 | 1.1M | $2.50 | $15.00 | 39 |
| GPT-5.5 | 1.1M | $5.00 | $30.00 | 38.4 |
| GPT-6 Luna | 1.1M | $0.100 | $0.500 | 38.1 |
| GPT-5.6 Luna | 1.1M | $0.200 | $1.20 | 37.3 |
| GPT-5.2 | 400K | $1.75 | $14.00 | 30.4 |
| GPT-5.2-Codex | 400K | $1.75 | $14.00 | 28.5 |
| GPT-5.1 | 400K | $1.25 | $10.00 | 24.7 |