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GPT-5.3-Codex openai
Release timeline
Stages observed by the nightly radar: announced → API only → weights public → served by third parties. Each entry carries the source it was seen at.
- 2026-02-24 · API only source seeded from the earliest dated observation when first seen · observed 2026-10-07 20:20 UTC
Description
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
via OpenRouter listing · observed 2026-10-24 21:26 UTC. The listing text is the provider's own description, not an assessment.
Where to run 2 providers · 3 endpoints
Hosted endpoints observed for GPT-5.3-Codex, sorted by input price (USD per million tokens). Each row names its observer and date; prices change daily, so check the source before quoting. Cheapest observed input price: $1.75/M.
| Provider | Model ref | Context | Quant | $/M in | $/M out | tok/s | TTFT | Tools | Status | Observed |
|---|---|---|---|---|---|---|---|---|---|---|
| Azure openrouter | openai/gpt-5.3-codex | 391K | unknown | $1.75 | $14.00 | — | — | yes | live | 2026-10-24 |
| OpenAI openrouter | openai/gpt-5.3-codex | 391K | unknown | $1.75 | $14.00 | — | — | yes | live | 2026-10-24 |
| OpenAI openrouter | openai/gpt-5.3-codex | 391K | unknown | $3.50 | $28.00 | — | — | yes | live | 2026-10-24 |
No third-party providers observed beyond the lab's own endpoints. Cache-read price $0.17/M (source, observed 2026-10-24).
Facts
| Context length | 400,000 tokens (391K) · OpenRouter listing |
|---|---|
| Modalities | text + image + file → text |
| Max completion tokens | 128,000 |
| Supported parameters | include_reasoning, max_completion_tokens, max_tokens, reasoning, reasoning_effort, response_format, seed, structured_outputs, tool_choice, tools, verbosity |
| Openness | Closed weights · closed lab |
| Stage | API only |
| Confidence | medium |
| Pricing (USD per M tokens) |
in $1.75 · out $14.00 · cache read $0.17 OpenRouter list price (cheapest live endpoint) · source · observed 2026-10-24 21:26 UTC |
Open alternatives 5
Nearest open-weights models by modality, context and price on this watch list. Not a quality ranking.
| Model | Org | Params | Context | $/M in | License | Why it is here |
|---|---|---|---|---|---|---|
| Qwen3.5-4B | Qwen | 4.66B | 256K | — | apache-2.0 | vision input |
| Kimi-K2.6 | moonshotai | 1.03T | 256K | $0.45 | other | cheaper input price ($0.44935/M vs $1.75/M), vision input |
| Qwen3.5-397B-A17B | Qwen | 403B | 256K | $0.39 | apache-2.0 | cheaper input price ($0.39/M vs $1.75/M), vision input |
| Qwen3-VL-4B-Instruct | Qwen | 4.44B | 256K | — | apache-2.0 | vision input |
| Kimi-K2.5 | moonshotai | 1.03T | 256K | $0.45 | other | cheaper input price ($0.45/M vs $1.75/M), vision input |
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- /feeds/upcoming.xml(RSS 2.0) · upcoming and just-released models, one item per entry
- /feeds/upcoming.json(JSON Feed 1.1) · same, JSON Feed 1.1
Email alerts are not open yet; the feeds above are the same data. See feeds for the item schema.
Sources
- openrouter openai/gpt-5.3-codex · observed 2026-10-24 21:26 UTC
Radar run: 2026-10-25 06:51 UTC · Last verified 2026-10-25 06:51 UTC