Model Library
OpenAIReleased February 5, 2026GPT-5.3 Codex (xhigh)
OpenAI · Released February 5, 2026
Intelligence score
44
At a glance
- Intelligence
- 44
- Speed
- 99.0tokens/sec
- Latency
- 98.73stime to first token
- Input price
- $1.75per 1M tokens
- Output price
- $14.00per 1M tokens
- Context window
- 400Ktokens
- Parameters
- —
Summary
Comparison summary
GPT-5.3 Codex (xhigh) scores 44 (estimated) on the Artificial Analysis Intelligence Index, placing it well above average among other reasoning models in a similar price tier (median: 28). GPT-5.3 Codex (xhigh) generates output at 99.0 tokens per second (based on OpenAI's API), which is above average compared to other reasoning models in a similar price tier (median: 81.2 t/s). GPT-5.3 Codex (xhigh) costs $1.75 per 1M input tokens (somewhat higher than average, median: $1.50) and $14.00 per 1M output tokens (somewhat higher than average, median: $8.40), based on OpenAI's API.
Specifications
Technical specifications
| Model name | GPT-5.3 Codex (xhigh) |
|---|---|
| Provider | OpenAI |
| Release date | February 5, 2026 |
| Intelligence score | 44 |
| Speed | 99.0 tokens/sec |
| Latency (TTFT) | 98.73s |
| Input price | $1.75 / 1M tokens |
| Output price | $14.00 / 1M tokens |
| Context window | 400,000 tokens |
| Parameters | — |
| Reasoning | Yes |
| Input modalities | text, image |
| Output modalities | — |
| Open weights | No |
| License | — |
| API availability | — |
| Source | Model Intelligence legacy profile: gpt-5-3-codex |
Pricing
Token prices
Price per 1M tokens
GPT-5.3 Codex (xhigh), as listed in the catalog record
- Input$1.75
- Output$14.00
| Token type | Price per 1M |
|---|---|
| Input | $1.75 |
| Output | $14.00 |
Model Intelligence legacy profile: gpt-5-3-codex
FAQ · 19
Frequently asked questions
GPT-5.3 Codex (xhigh) was released on February 5, 2026.
GPT-5.3 Codex (xhigh) was created by OpenAI.
GPT-5.3 Codex (xhigh) scores 44 (estimated) on the Artificial Analysis Intelligence Index, placing it well above average among other reasoning models in a similar price tier (median: 28).
GPT-5.3 Codex (xhigh) generates output at 99.0 tokens per second (based on OpenAI's API), which is above average compared to other reasoning models in a similar price tier (median: 81.2 t/s).
GPT-5.3 Codex (xhigh) has a time to first token (TTFT) of 98.73s (based on OpenAI's API), which is at the higher end compared to other reasoning models in a similar price tier (median: 2.78s).
GPT-5.3 Codex (xhigh) costs $1.75 per 1M input tokens (somewhat higher than average, median: $1.50) and $14.00 per 1M output tokens (somewhat higher than average, median: $8.40), based on OpenAI's API.
GPT-5.3 Codex (xhigh) costs $1.75 per 1M input tokens and $14.00 per 1M output tokens (based on OpenAI's API). For a blended rate (7:2:1 cache hit/input/output ratio), this is $1.87 per 1M tokens. Pricing may vary by provider.
Yes, GPT-5.3 Codex (xhigh) is a reasoning model. It uses extended thinking or chain-of-thought reasoning to work through complex problems before providing an answer.
GPT-5.3 Codex (xhigh) supports text and image input.
GPT-5.3 Codex (xhigh) supports text output.
Yes, GPT-5.3 Codex (xhigh) supports image input and can analyze, describe, and answer questions about images.
Yes, GPT-5.3 Codex (xhigh) is multimodal. It can process text and image input and generate text output.
GPT-5.3 Codex (xhigh) has a context window of 400k tokens. This determines how much text and conversation history the model can process in a single request.
No, GPT-5.3 Codex (xhigh) is proprietary. The model weights are not publicly available.
GPT-5.3 Codex (xhigh) is a proprietary model and OpenAI has not disclosed the model size or parameter count.
GPT-5.3 Codex (xhigh) achieves a score of 44 on the Artificial Analysis Intelligence Index. This composite benchmark evaluates models across reasoning, knowledge, mathematics, and coding.
GPT-5.3 Codex (xhigh) has a knowledge cutoff of August 2025. The model's training data includes information up to this date.
Yes, GPT-5.3 Codex (xhigh) is available via API through 1 provider.
GPT-5.3 Codex (xhigh) is available through 1 API provider.