Autonomous Repo-Level Editing
The gpt 5 codex api reasons across a 256k window to perform multi-file refactors while maintaining architectural patterns in large codebases.
GPT 5 Codex
The gpt 5 codex api by OpenAI is a frontier-class model for the full software development lifecycle. It offers a 256k context window, autonomous repo-level editing, and native vision-to-code generation with unparalleled reasoning.
API Usage Examples
curl --request POST "https://gptproto.com/v1/chat/completions" \
--header "Authorization: Bearer $GPTPROTO_API_KEY" \
--header "Content-Type: application/json" \
--data '{
"model": "gpt-5-codex",
"messages": [
{
"role": "user",
"content": "Hello"
}
]
}'GPT 5 Codex pricing
Chat, coding agents & document work. Priced per 1M tokens — input, cached input and output are billed separately. GPTProto is 30% below official rates.
Your usage
OpenAI · ≈ 148M tokens/mo (48M cached)
OpenRouter
List + 5.5% credit fee
$259.53
per month
Input (non-cached)$42.20
Cache read$6.33
Output$211
OpenAI
Direct from OpenAI (list price)
$246
per month
Input (non-cached)$40
Cache read$6
Output$200
BEST VALUE
GPTProto
30% off official
$172.20
per month
After discount$172.20
Effective$172.20
Monthly cost by source
OpenRouter
$259.53
OpenAI
$246
GPTProto
$172.20
Save $73.80 / month
on GPTProto vs OpenAI (−30%)
Annual savings ≈ $885.60 · pay as you go
OpenRouter costs include its ~5.5% credit purchase fee. GPTProto applies a per-model discount (10–30% off) and your bonus credits are also spent at discounted rates — savings compound. Estimates assume a 60% cache hit rate.
Related Models
All Models
| Model | Input → Output | ||||
|---|---|---|---|---|---|
| — | $0.88 / $7.00 per 1M | $0.09 / $0.09 per 1M | Input: TextInput: Image Output: Text | |
| — | — | $0.30 / $1.20 per 1M | — / $0.006 per 1M | Input: TextInput: Image Output: Text | |
| 1.05M | $0.79 / $2.38 per 1M | — / $0.04 per 1M | Input: Text Output: Text | ||
| 1.05M | $8.00 / $40.00 per 1M | $10.00 / $0.80 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $0.90 / $4.50 per 1M | $0.60 / $0.09 per 1M | Input: TextInput: ImageInput: VideoInput: DocumentInput: Audio Output: Text | ||
| 1M | $9.00 / $45.00 per 1M | $11.25 / $0.23 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1M | $1.80 / $5.40 per 1M | $2.25 / $0.23 per 1M | Input: TextInput: ImageInput: VideoInput: DocumentInput: Audio Output: Text | ||
| — | 1.31M | $0.15 / $0.50 per 1M | — / $0.03 per 1M | Input: TextInput: ImageInput: VideoInput: Document Output: Text | |
| — | 1.05M | $0.30 / $1.20 per 1M | — / $0.006 per 1M | Input: TextInput: Image Output: Text | |
| 1.31M | $1.26 / $3.96 per 1M | — / $0.23 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $0.90 / $4.50 per 1M | $0.60 / $0.09 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 500K | $1.20 / $3.60 per 1M | — / $0.30 per 1M | Input: TextInput: Image Output: Text | ||
| 1M | $1.80 / $5.40 per 1M | $2.25 / $0.23 per 1M | Input: TextInput: ImageInput: VideoInput: Document Output: Text | ||
| 1M | $4.50 / $22.50 per 1M | $5.63 / $0.45 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $0.90 / $4.50 per 1M | $0.60 / $0.09 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $2.70 / $13.50 per 1M | $0.27 / $0.27 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $0.16 / $0.96 per 1M | $0.20 / $0.02 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $1.60 / $9.60 per 1M | $2.00 / $0.16 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $3.20 / $16.00 per 1M | $4.00 / $0.32 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 500K | $1.20 / $3.60 per 1M | $0.30 / $0.30 per 1M | Input: TextInput: Image Output: Text | ||
| 1M | $1.80 / $9.00 per 1M | $2.25 / $0.18 per 1M | Input: TextInput: Document Output: Text | ||
| 1.05M | $0.48 / $0.96 per 1M | $0.10 / $0.10 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $1.26 / $3.96 per 1M | $0.23 / $0.23 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| — | $1.00 / $8.00 per 1M | $0.10 / $0.10 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1M | $0.36 / $1.44 per 1M | $0.07 / $0.07 per 1M | Input: TextInput: Document Output: Text | ||
| — | 1.05M | $0.30 / $1.20 per 1M | — / $0.006 per 1M | Input: Text Output: Text | |
| 1M | $0.75 / $1.50 per 1M | $0.12 / $0.12 per 1M | Input: TextInput: Image Output: Text | ||
| 1.05M | $24.00 / $144.00 per 1M | — | Input: TextInput: ImageInput: Document Output: Text | ||
| 262K | $0.85 / $3.60 per 1M | $0.14 / $0.14 per 1M | Input: TextInput: Document Output: Text | ||
| 205K | $0.24 / $0.96 per 1M | $0.30 / $0.02 per 1M | Input: TextInput: Document Output: Text | ||
| 262K | $0.54 / $2.70 per 1M | $0.09 / $0.09 per 1M | Input: TextInput: Document Output: Text | ||
| 262K | $0.10 / $0.97 per 1M | — | Input: TextInput: Image Output: Text | ||
| 262K | $0.10 / $0.97 per 1M | — | Input: TextInput: Image Output: Text | ||
| 262K | $0.02 / $0.18 per 1M | — | Input: TextInput: Image Output: Text |
gpt 5 codex api Key Features
Explore the technical breakthroughs that make the gpt 5 codex api the preferred choice for modern engineering teams requiring high-reasoning gpt capabilities.
Visual UI-to-Code Generation
Converts Figma screenshots or hand-drawn wireframes into production-ready React or SwiftUI code via the gpt 5 codex api vision layer.
Advanced Debugging Reasoning
Uses internal gpt Chain-of-Thought reasoning to identify complex race conditions and memory leaks that standard linters cannot detect.
Native Test Orchestration
The gpt 5 codex api writes tests and executes them via function calling, self-correcting based on terminal output until all tests pass.
gpt 5 codex api FAQ
Find answers about gpt 5 codex api features, pricing, and integration. Learn how to leverage OpenAI's most advanced coding model via GPTProto.com.
How does gpt 5 codex handle large repositories?
The gpt 5 codex api utilizes a 256k context window to ingest entire modules. Unlike older models, this gpt version reasons across multiple files to ensure architectural patterns and dependencies remain consistent during large-scale refactors or migrations.
What is the cost of the gpt 5 codex api?
Pricing for gpt 5 codex is $5.00 per 1M input tokens and $15.00 per 1M output tokens. Through GPTProto.com, you get a 50% discount on cached inputs and an additional 5% volume discount for monthly spends over $2,000 across our aggregated gpt providers.
Can gpt 5 codex generate code from images?
Yes. The gpt 5 codex api features native vision integration. This gpt model can process Figma screenshots or system architecture diagrams and output production-ready code in frameworks like React or SwiftUI with over 90% visual accuracy.
Is code sent to the api used for training?
No. When accessing the gpt 5 codex api through our enterprise aggregation platform, your code and data are strictly excluded from training datasets. We prioritize security and privacy for all gpt-driven proprietary development projects.
What programming languages does gpt 5 codex support?
The gpt 5 codex api supports over 80 programming languages. It achieves SOTA performance in Python, TypeScript, Rust, Go, and C++. It is particularly effective for legacy migrations, such as moving COBOL monoliths to modern gpt-optimized architectures.
How do I manage rate limits for the api?
The default tier for gpt 5 codex allows 10,000 RPM. If you hit limits, our platform provides automatic failover to secondary clusters. We also offer tools to truncate large files to fit within the 256k window, ensuring reliable gpt request fulfillment.
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