How much does GPT-5.3 Chat cost per month?

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

Does GPT-5.3 Chat 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 Chat's context window?

GPT-5.3 Chat accepts up to 128,000 tokens (128K) of context and returns up to 16,384 tokens per response.

GPT-5.3 Chat API Pricing

OpenAI has deprecated this model. The price is kept here for reference; check the provider's documentation before building on it.

OpenAI · released Mar 3, 2026 · 128K context · API model ID gpt-5.3-chat-latest

GPT-5.3 Chat by OpenAI API pricing: $1.75 per 1M input tokens and $14.00 per 1M output tokens (provider list price via models.dev, Oct 10, 2026).

Prices

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

OpenAI's list price for its own API, as compiled by models.dev and checked Oct 10, 2026, 09:00 UTC. Prices on cloud platforms and resellers can differ. Provider documentation

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: 128,000 tokens
Max output: 16,384 tokens
Input: text, image
Output: text
Knowledge cutoff: Aug 31, 2025
Open weights: No
Tool calling: Yes
Reasoning: No
Structured outputs: Yes

Capabilities and limits as listed by models.dev.

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Price history

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

Questions

How much does GPT-5.3 Chat cost per month?: For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, GPT-5.3 Chat costs about $2,625 per month at OpenAI's list prices ($1.75 per 1M input tokens, $14.00 per 1M output tokens).
Does GPT-5.3 Chat 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 Chat's context window?: GPT-5.3 Chat accepts up to 128,000 tokens (128K) of context and returns up to 16,384 tokens per response.