Coding-optimized GPT model for repository edits, reviews, and agentic software work
GPT-5.3 Codex Spark by openai is offered by 3 providers on this page. Public prices are shown for 2 of them. Its official list price is $1.75 per 1M input tokens and $14.00 per 1M output tokens. It also has 1 free ($0) channel; free tiers usually carry rate limits, and subscription-covered access bills $0 per token only after the subscription fee.
The context window is 128,000 tokens, with an output limit of 32,000 tokens. It supports reasoning, tool use, and structured output. Accepted input modalities are Text, Image, and PDF. Providers report the capability flags inconsistently, so verify a specific feature against the host you plan to use. Its training knowledge cuts off at 2025-08-31.
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Poe | Gateway | Free | — | — | 128,000 | 16,384 | ||
| OpenCode Zen | Gateway | $1.75 | $14.00 | $0.18 | — | 128,000 | 128,000 | |
| OpenAIOfficial | First-party | $1.75 | $14.00 | $0.18 | — | 128,000 | 32,000 |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
1 / 3 providers expose no reasoning control (reasoning_options: []).
1 more channels offer $0 (Poe); free tiers usually have rate limits and no SLA, excluded from ranking.