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OpenAI: GPT-5.3-Codex

openai/gpt-5-3-codex
CompareAPITry this model

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.

Modalities
In / out per 1M$1.75 / $14
Context391K
ReleasedFeb 24, 2026

Providers

3 providers serve this model upstream.

Providers serving this model
ProviderInput /MOutput /MCache read /MLatency P50Throughput P50Uptime
Azure$1.75$14$0.176.81s19 tps100%
OpenAI$1.75$14$0.172.44s63 tps100%
OpenAI$3.50$28$0.35———

Market-wide measurements, refreshed every 15 minutes. They describe who serves GPT-5.3-Codex in general, not how ProjectCOZY routes your requests.

Pricing

List rates per 1M tokens — what GPT-5.3-Codex costs pay-as-you-go elsewhere, not what you pay here.

Input
$1.75
per 1M tokens
Output
$14
per 1M tokens
Cache read
$0.17
per 1M cached tokens
Included in every pass
GPT-5.3-Codex is included in every ProjectCOZY pass at no extra cost — one flat rate, no per-token metering. The rates above are there for comparison.

Performance

Time to first token and output speed across every provider, over the last 3 days.

0.0s5.0s10.0s15.0s20.0s
Oct 11, 12 AMOct 11, 8 AMOct 11, 4 PMOct 12, 12 AMOct 12, 8 AMOct 12, 4 PMOct 13, 12 AMOct 13, 8 AMOct 13, 4 PMOct 14, 12 AMOct 14, 8 AM
OpenAI Azure
0 tok/s50 tok/s100 tok/s150 tok/s200 tok/s
Oct 11, 12 AMOct 11, 8 AMOct 11, 4 PMOct 12, 12 AMOct 12, 8 AMOct 12, 4 PMOct 13, 12 AMOct 13, 8 AMOct 13, 4 PMOct 14, 12 AMOct 14, 8 AM
OpenAI Azure

Uptime

100% of requests were served successfully over the last 3 days, across all providers.

Last 3 daysAvailability 76.9%
Oct 11, 2:00 PMNow
Availability over the last 24 hoursAvailability 77.86%
100% 86% 73% 60%
Oct 13, 2:50 PMNow

Apps

Tools that most often run GPT-5.3-Codex, by tokens this week.

CodexCli Agent · 58.6% of tokens110.6BFramer28.6% of tokens53.9BItoCloud Agent · 9.8% of tokens18.5BOpenHandsCli Agent · 1.5% of tokens2.9BC3PR1.5% of tokens2.9B

Activity

250.8B tokens processed market-wide in the last month.

020.0B40.0B60.0B80.0B
Sep 14Sep 19Sep 24Sep 29Oct 4Oct 9Oct 14
Tokens

FAQ

Which model id do I use for GPT-5.3-Codex?
openai/gpt-5.3-codex. Send it as the model field from any OpenAI-compatible client, against http://192.168.1.55/v1.
How much context does GPT-5.3-Codex hold?
400,000 tokens per request, of which up to 128,000 can be the response.
What can it accept and return?
Input: text, image, file. Output: text.
What does GPT-5.3-Codex cost on a pass?
Nothing beyond the pass itself. Pay-as-you-go elsewhere it lists at $1.75 per 1M input tokens and $14 per 1M output tokens.
Who built GPT-5.3-Codex?
OpenAI, in the GPT family.

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