GPT-5 Codex — OpenAI | Modeldex

GPT-5 Codex

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GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....

Updated 4 days agoStructured data from Modeldex catalog

VisionAgenticLong context

Knowledge cutoff

Sep 30, 2024(1.6 years ago)

API release

Sep 23, 2025(7 months ago)

Not enough benchmark coverage yet for an Intelligence Index — needs at least 3 results across 2 categories.

Overview

History

GPT-5 Codex became available via the OpenAI API on 2025-09-23.

Training & availability

Training data has a knowledge cutoff of 2024-09-30 — information about events after that date is unlikely to appear in the model's responses. OpenAI has not released the underlying model weights — access is via their hosted API only.

Capabilities

Context window: 272K tokens.
Max output: 128K tokens.
Input modalities: text, image.

Recommended for: vision, agentic, long-context.

Limitations

The knowledge cutoff is 18 months old — this model will not know about recent events, releases, or API changes.

Pricing

Input: $1.2500 per 1M tokens
Output: $10.0000 per 1M tokens

Use the cost calculator above to estimate monthly spend for your workload.

Quick start

Minimal example using the openai API. Copy, paste, replace the key.

from openai import OpenAI

client = OpenAI(api_key="sk-...")
resp = client.chat.completions.create(
    model="gpt-5-codex",
    messages=[{"role": "user", "content": "Explain quantum computing in one sentence."}],
)
print(resp.choices[0].message.content)

Cost calculator

Estimate your monthly bill. Presets are typical workload sizes.

Input tokens / month5.0M

@ $1.25/1M

Output tokens / month2.0M

@ $10/1M

Input cost

$6.25

5.0M × $1.25/1M

Output cost

$20

2.0M × $10/1M

Total / month

$26.25

$315 / year

Providers & performance

1 provider

Multi-provider inference routes for this model — sorted by throughput. Latency is time-to-first-token; throughput is output tokens per second. Data from OpenRouter, measured over the last 30 minutes.

Provider	Throughput	Latency (TTFT)	Input $ / 1M	Output $ / 1M	Context	Quant	Supports
OpenAI	53tok/s	2.40s	$1.25	$10	400K	—	tools · json

Integrations & tooling support

Tool calling: Supported
Structured outputs: Not supported

Price vs quality

Mid-tier pricing

Standard pricing band. Quality tier pending more benchmark coverage.

Quality percentile: —
Effective price: $7.81/1M
Pricing breakdown: $1.25/1M in
$10/1M out

Community ratings

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