How much does GPT-5.3 Codex cost per month?

For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, GPT-5.3 Codex costs about $2,625 per month at the provider's official prices (verified) ($1.75 per 1M input tokens, $14.00 per 1M output tokens).

Does GPT-5.3 Codex support prompt caching?

Yes. Cached input costs $0.175 per 1M tokens, compared with $1.75 for regular input.

How long is GPT-5.3 Codex's context window?

GPT-5.3 Codex accepts up to 400,000 tokens (400K) of context and returns up to 128,000 tokens per response.

GPT-5.3 Codex API Pricing

OpenAI · released Feb 5, 2026 · 400K context · API model ID gpt-5.3-codex

GPT-5.3 Codex by OpenAI API pricing: $1.75 per 1M input tokens and $14.00 per 1M output tokens (verified against the official pricing page, Oct 9, 2026).

Prices

GPT-5.3 Codex prices, USD per 1M tokens
Price	USD per 1M tokens
Input	$1.75
Output	$14.00
Cache read	$0.175
Cache write	Not published

Verified against the provider's official pricing page on Oct 9, 2026. Official pricing page

Estimated monthly cost

$2,625

per month

per day: $87.50
per request: $0.00875

Cost = input tokens × input price + output tokens × output price, 30 days a month. Cached input uses the cache read price. Cache write fees are not included.

Compare this workload across models

Monthly cost by workload

Workload	Per month
Chatbot1,000 in / 500 out tokens, 10,000 requests a day	$2,625/mo
RAG8,000 in / 500 out tokens, 5,000 requests a day	$3,150/mo
Coding agent50,000 in / 2,000 out tokens, 1,000 requests a day, 80% cached input	$1,575/mo

Context and capabilities

Context: 400,000 tokens
Max output: 128,000 tokens
Input: text, image, pdf
Output: text
Knowledge cutoff: Aug 31, 2025
Open weights: No
Tool calling: Yes
Reasoning: Yes
Structured outputs: Yes

Capabilities and limits as listed by models.dev.

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Kimi K3 · $3.00 in / $15.00 out

Price history

No price changes since we started tracking on Oct 8, 2026.

Questions

How much does GPT-5.3 Codex cost per month?: For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, GPT-5.3 Codex costs about $2,625 per month at the provider's official prices (verified) ($1.75 per 1M input tokens, $14.00 per 1M output tokens).
Does GPT-5.3 Codex support prompt caching?: Yes. Cached input costs $0.175 per 1M tokens, compared with $1.75 for regular input.
How long is GPT-5.3 Codex's context window?: GPT-5.3 Codex accepts up to 400,000 tokens (400K) of context and returns up to 128,000 tokens per response.