OpenAI / openai/gpt-5-codex
GPT-5-Codex - access through LLMTR
One of the first GPT-5 variants optimized for agentic coding and multi-file engineering work. Older than the newest Codex releases, but still a strong base option.
Technical specifications
| Canonical ID | openai/gpt-5-codex |
|---|---|
| Provider | OpenAI |
| Context window | 400,000 tokens |
| Operations | RESPONSES |
| Modalities | text, image |
Pricing
A 6% platform margin applies to credit top-ups; model usage prices are not separately marked up.
| Operation | Metric | Unit | Price |
|---|---|---|---|
| RESPONSES | INPUT_TEXT | PER_1M_TOKENS | $1.25 |
| RESPONSES | CACHE_READ | PER_1M_TOKENS | $0.125000 |
| RESPONSES | OUTPUT_TEXT | PER_1M_TOKENS | $10.00 |
Example usage
With existing OpenAI SDK flows, change only the base URL and model identifier.
curl https://llmtr.com/v1/chat/completions \
-H "Authorization: Bearer llmtr-your_key" \
-H "Content-Type: application/json" \
-d '{"model":"openai/gpt-5-codex","messages":[{"role":"user","content":"Hello"}]}'