GPT-5.3-Codex

GPT-5.3-Codex is the latest version of the Codex series, optimized for long-horizon, agentic coding tasks. It's available in the Responses API only and supports low, medium, high, and xhigh reasoning effort settings.

Input price
$1.575list $1.75-10%
Output price
$12.60list $14.00-10%
Context
400K
Max output
128K
Modalities
InputTextImageOutputText
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Released
2026-02-06
Knowledge cutoff
2025-08-31
Try in ChatCompare

Providers

This model is served by the dedicated providers below. We pick the provider for each request, so provider preferences don’t apply, including a provider named in your request. Prices in USD per 1M tokens. Need a custom setup? Contact [email protected].

Included providers2
  • SuccessTTFT
  • Azure AI FoundryGlobal——
  • OpenAIUnited States——

Pricing

Prices for this model. Each request is billed at these prices, whichever provider serves it.

ItemPricePriority
Inputper 1M tokens$1.575list $1.75-10%$3.15list $3.50-10%
Outputper 1M tokens$12.60list $14.00-10%$25.20list $28.00-10%
Cache readper 1M tokens$0.1575list $0.175-10%$0.315list $0.35-10%
Batch inputper 1M tokens$0.7875list $0.875-10%—
Batch outputper 1M tokens$6.30list $7.00-10%—
Web searchper request$0.009list $0.01-10%—

Make a request

Set your provider preferences, then copy the request. It reads your API key from OHMYGPT_API_KEY.

Provider preferences don’t apply to this model. Need a custom setup? Contact [email protected].

curl https://api.ohmygpt.com/v1/responses \
  -H "Authorization: Bearer $OHMYGPT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.3-codex",
    "input": "Hello"
  }'

Similar models

Other models with the same output types at a similar price.

  • Better value: more capable, lower price
  • Pareto frontier
  • Similar models

Capability scores are from Epoch AI’s Epoch Capabilities Index (CC BY 4.0, as of 2026-11-02), which combines dozens of benchmarks with GPT-5 set at 150. epoch.ai/eci

Price: our current input price per 1M tokens in USD, lowest across channels. Dated snapshots and resold copies of the same model are merged into one point; free models are not shown.

Shaded area: capability above and price below the median of all models. Pareto frontier: no other model is both cheaper and more capable.

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