GPT-5 Codex
VerifiedOpenAI's multimodal model for large-scale text and image tasks.
About GPT-5 Codex
GPT-5 Codex was developed by OpenAI as a proprietary multimodal system. It processes combined text and image data across an extensive 400,000-token context. Access is limited to API usage since the weights are not released.
The architecture supports sustained coherence over very long multimodal sequences. This enables detailed analysis of documents paired with visual references. Typical applications include research workflows and content generation that require both visual and textual context.
Capabilities
How GPT-5 Codex compares
GPT-5 Codex (striped bar) vs other multimodal on intelligence, speed and price.
Price
USD per 1M output tokens · Lower is better · GPT-5 Codex ranks #65 of 100
Sources: Artificial Analysis (intelligence, speed) · OpenRouter (price).
Best for
Long-Context Codebase Analysis
The model excels at reviewing and refactoring repositories spanning hundreds of thousands of tokens while incorporating visual diagrams or UI screenshots for context.
Multimodal Document Workflows
It processes complex documents that combine text, tables, and images, enabling extraction of insights and generation of updated code or reports in a single pass.
Vision-Integrated Development Tasks
Developers can pair code generation requests with screenshots or design mocks to receive both implementation code and visual verification suggestions.
Strengths & limitations
Strengths
- +Handles extremely large inputs effectively
- +Strong coding specialization
- +Unified text and image reasoning
Limitations
- –High resource demands with maximum context
- –Limited to text and static images
- –Potential coherence loss in very long outputs
Cost calculator
Estimate what GPT-5 Codex would cost for your usage.
Based on GPT-5 Codex's $1.25/1M input · $10.00/1M output. Estimate only — actual cost varies by provider and caching.
Quick start
OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. Only the model slug changes between models.
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://openrouter.ai/api/v1",
apiKey: process.env.OPENROUTER_API_KEY,
});
const completion = await client.chat.completions.create({
model: "openai/gpt-5-codex",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(completion.choices[0].message.content);Model slug: openai/gpt-5-codex
Editor's verdict
GPT-5 Codex is OpenAI's proprietary multimodal with a 400K-token context window.
At $10.00 per 1M output tokens, it is premium-priced for its class.
It is available through OpenAI's API and aggregators like OpenRouter.
Best suited to handles extremely large inputs effectively and strong coding specialization.
Frequently asked questions
The model supports a context length of 400000 tokens.
User reviews
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