OpenAI's GPT-5.3 Codex, optimized for code generation and long-running agentic engineering tasks. The most economical model in the GPT-5 lineup for developer workloads.
Every rate is 50% of the provider's official list price. USD per million tokens.
| Token type | List price | Tokenless |
|---|---|---|
| Input | $1.75 | $0.88 |
| Output | $14.00 | $7.00 |
| Cache write | $1.75 | $0.88 |
| Cache read | $0.18 | $0.09 |
Tokenless speaks the OpenAI Chat Completions format. Point your client at the base URL, set model to gpt-5.3, and you are done.
curl https://api.tokenless.store/api/v1/chat/completions \
-H "Authorization: Bearer $TOKENLESS_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-5.3",
"messages": [{ "role": "user", "content": "Hello" }]
}'