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Proprietary model

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Released February 2026

GPT-5.3 Codex: Intelligence, Performance & Price Analysis

Name: Intelligence
Creator: Artificial Analysis
License: https://artificialanalysis.ai/docs/legal/Terms-of-Use.pdf

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Available providers

OpenAI

Intelligence

N/A

Artificial Analysis Intelligence Index

Performance

Time to first answer token 44.55sOutput speed 87 tok/s

N/A

Time per Intelligence Index task (minutes)

Cost

In $1.75Out $14.00Cache discount 90%

N/A

Cost per Intelligence Index task

Verbosity

N/A

Output tokens from Intelligence Index

GPT-5.3 Codex (Xhigh) supports text and image input, outputs text, and has a 400k tokens context window with knowledge up to August 2025.

Pricing for GPT-5.3 Codex (Xhigh) is $1.75 per 1M input tokens (moderately priced, median: $2.00) and $14.00 per 1M output tokens (somewhat expensive, median: $10.00).

Reasoning	Yes
Input modality	Supports: text and image
Output modality	Supports: text
Knowledge cutoff	Aug 31, 2025
Context window	400k ~600 A4 pages of size 12 Arial font

Metrics are compared against models of the same class:

Non-reasoning models → compared only with other non-reasoning models
Reasoning models → compared across both reasoning and non-reasoning
Open weights models → compared only with other open weights models of the same size class:

Tiny: ≤4B parameters
Small: 4B–40B parameters
Medium: 40B–150B parameters
Large: >150B parameters

Proprietary models → compared across proprietary and open weights models of the same price range, using a blended 3:1 input/output price ratio:

<$0.15 per 1M tokens
$0.15–$1 per 1M tokens
>$1 per 1M tokens

Intelligence

Artificial Analysis Intelligence Index · Higher is better

No publicly available API

Time per Task

Inference time (minutes) per Intelligence Index task · Lower is better

No publicly available API

Cost per Task

Weighted average cost (USD) per Intelligence Index task · Lower is better

No publicly available API

Intelligence

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index v5.0.1 incorporates 9 evaluations: AA-Briefcase v1.1, AutomationBench-AA, Terminal-Bench 4.0, FrontierCode-AA 2.0, AA-Omniscience v1.1, GDP.pdf, HLE-Diamond, CritPt v2 (Hard Subset), and Terminal-Bench-Science 0.1

Artificial Analysis Intelligence Index v5.0.1 includes: AA-Briefcase v1.1, AutomationBench-AA, Terminal-Bench 4.0, FrontierCode-AA 2.0, AA-Omniscience v1.1, GDP.pdf, HLE-Diamond, CritPt v2 (Hard Subset), Terminal-Bench-Science 0.1. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.

Artificial Analysis Intelligence Index by Open Weights / Proprietary

Indicates whether the model weights are available. Models are labelled as 'Commercial Use Restricted' if commercial use is limited by conditions, and as 'Non-commercial' if the license prohibits commercial use.

Intelligence Index vs. Cost per Task

Artificial Analysis Intelligence Index · Weighted average cost (USD) per Artificial Analysis Intelligence Index task

Most attractive quadrant

Pareto line

Weighted average cost per Intelligence Index task. Each evaluation’s cost is calculated from input, cache hit, cache write, reasoning, and answer token prices, divided by task count, and weighted by its Intelligence Index weight.

Benchmarks

Evaluations

Intelligence evaluations measured independently by Artificial Analysis · Higher is better

AA-Briefcase v1.1

Agentic knowledge work, Elo

MMMU-Pro

Visual reasoning

While model intelligence generally translates across use cases, specific evaluations may be more relevant for certain use cases.

Cost

Cost per Intelligence Index Task

Weighted average cost (USD) per Intelligence Index task · Segmented by token type · Lower is better

Cost to Run Artificial Analysis Intelligence Index

Cost (USD) to run all evaluations in the Artificial Analysis Intelligence Index

The cost to run the evaluations in the Artificial Analysis Intelligence Index, calculated using the model's input, cache hit, cache write, reasoning, and answer token prices and the number of tokens used across evaluations (excluding repeats).

Pricing: Cache Hit, Input, and Output

Price (USD per M Tokens)

Price per token for cached prompts (previously processed), typically offering a significant discount compared to regular input price, represented as USD per million tokens. The values shown here are the cache hit price; cache write and cache storage are billed separately and vary by provider — see "Cache pricing by provider" for detail.

Performance

Measured by time per task (minutes), output speed (tokens per second), time to first answer token and time to first token (seconds)

Time per Intelligence Index Task

Output tokens divided by end-to-end output speed (minutes per Intelligence Index task) · Speed at the model's own endpoint or the median across providers · Lower is better

The weighted average time (minutes) per Artificial Analysis Intelligence Index task: output tokens per task divided by output speed, weighted by each benchmark's weight in the Intelligence Index.

Speed and latency metrics average each endpoint's runs over the past 5 days, and the error rate pools them. We run the benchmark every 6 hours, and endpoints of deprecated models every 18 hours.

Output Speed

Output tokens divided by total request time, including time to first token · Higher is better

Output tokens, including reasoning tokens, received per second over a request's full duration, from sending the request to receiving the final token. The headline value averages each Performance v3 workload over the past 5 days, then averages the workloads.

Time to First Answer Token

Seconds to first answer token received · Accounts for reasoning model 'thinking' time

Time to first answer token received, in seconds, after API request sent. For reasoning models, this includes the 'thinking' time of the model before providing an answer. For models which do not support streaming, this represents time to receive the completion.

Context Window

Context window: tokens limit · Higher is better

Larger context windows are relevant to RAG (Retrieval Augmented Generation) LLM workflows which typically involve reasoning and information retrieval of large amounts of data.

Maximum number of combined input & output tokens. Output tokens commonly have a significantly lower limit (varied by model).

Further details

								Weights
GPT-5.3 Codex (Xhigh)	OpenAI	-	-	400k	$1.87	-	87	Not available

Frequently Asked Questions

Common questions about GPT-5.3 Codex

GPT-5.3 Codex was released on February 5, 2026.

GPT-5.3 Codex was created by OpenAI.

GPT-5.3 Codex has a time to first answer token of 44.55s (based on OpenAI's API), which is at the higher end compared to other models in a similar price tier (median: 13.66s).

GPT-5.3 Codex costs $1.75 per 1M input tokens (better than average, median: $2.00) and $14.00 per 1M output tokens (somewhat higher than average, median: $10.00), based on OpenAI's API.

GPT-5.3 Codex 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. Compare provider pricing

Yes, GPT-5.3 Codex 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 supports text and image input.

GPT-5.3 Codex supports text output.

Yes, GPT-5.3 Codex supports image input and can analyze, describe, and answer questions about images.

Yes, GPT-5.3 Codex is multimodal. It can process text and image input and generate text output.

GPT-5.3 Codex 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 is proprietary. The model weights are not publicly available.

GPT-5.3 Codex is a proprietary model and OpenAI has not disclosed the model size or parameter count.

GPT-5.3 Codex has a knowledge cutoff of August 2025. The model's training data includes information up to this date.

Yes, GPT-5.3 Codex is available via API through 1 provider. Compare API providers

GPT-5.3 Codex is available through 1 API provider. Compare providers

GPT-5.3 Codex: Intelligence, Performance & Price Analysis

Model summary

Verbosity

Technical specifications

242 models in this class

Intelligence

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index by Open Weights / Proprietary

Artificial Analysis Intelligence Index

Open Weights

Intelligence Index vs. Cost per Task

Cost per Intelligence Index Task

Artificial Analysis Intelligence Index

Evaluations

Intelligence Evaluation Relevance

Artificial Analysis Intelligence Index

Cost

Cost per Intelligence Index Task

Cost per Intelligence Index Task

Cost to Run Artificial Analysis Intelligence Index

Cost to Run Artificial Analysis Intelligence Index

Pricing: Cache Hit, Input, and Output

Cache Hit

Performance

Time per Intelligence Index Task

Time per Intelligence Index Task

Time Period

Output Speed

End-to-End Output Speed

Time to First Answer Token

Time to First Answer Token

Context Window

Context Window

Context Window for RAG

Context Window

Further details

More from OpenAI

Frequently Asked Questions

When was GPT-5.3 Codex released?

Who created GPT-5.3 Codex?

What is the latency of GPT-5.3 Codex?

How much does GPT-5.3 Codex cost?

What is GPT-5.3 Codex API pricing?

Is GPT-5.3 Codex a reasoning model?

What input modalities does GPT-5.3 Codex support?

What output modalities does GPT-5.3 Codex support?

Can GPT-5.3 Codex process images?

Is GPT-5.3 Codex multimodal?

What is the context window of GPT-5.3 Codex?

Is GPT-5.3 Codex open source?

How many parameters does GPT-5.3 Codex have?

What is the knowledge cutoff date for GPT-5.3 Codex?

Is GPT-5.3 Codex available via API?

Where can I use GPT-5.3 Codex?