// OpenAI
GPT-5.3 Codex
A OpenAI model. 1 prices across 1 channels side by side, each with its source and check date – plus specs, licence, speed and benchmarks.
- Official in/out per 1M
- $1.75 / $14
- Lowest (official)
- $1.75 / $14
- Context
- 400K
- AA index
- 32.5
Prices checked 2026-10-22Official sources linked on every rowNo estimates
01Specs at a glance
Official values first; gaps filled from OpenRouter’s API where the vendor page is silent.
| Vendor | OpenAI |
|---|---|
| Context window | 400K (400,000 tokens) |
| Max output | 128K |
| Input | Text · Image · File/PDF |
| Output | Text |
| Tool calling / JSON | Yes / Yes |
| Weights & licence | Closed · Proprietary (API only) |
| Released | Feb 24, 2026 (OpenRouter listing date) |
| Model IDs | gpt-5.3-codex |
02Prices on 1 channels
Per 1M tokens, in the currency each source publishes (1 USD = 6.7 CNY for the blended column). Sorted: official first, then cheapest.
| Channel | Source | Input | Output | Cache hit | Blended $ | Context | Notes |
|---|---|---|---|---|---|---|---|
| Official Vendor API, billed in USD | Official 10-22 | $1.75 | $14 | $0.175 | 4.81 | 400K | Responses API only (no Chat Completions, no Batch). Fast tier on pricing page: $3.50 in / $28 out / $0.35 cached (2x). |
“Official” = vendor pricing page; “Platform” = the platform’s own pricing page; “OpenRouter” = price listed on OpenRouter, not checked on the platform’s site. Click a source tag to open the original page.
03Where you can use it
Derived only from the price sources above. Country restrictions are set by each vendor – check their terms before you sign up.
- Vendor API, billed in USD
Official
04Performance
Speed and AA index from Artificial Analysis public leaderboards (not our own tests); benchmark scores from our benchmark library, best result per benchmark.
- AA indexGPT-5.3 Codex (Xhigh)
- 32.5
- Output speed (median)
- 90 tok/s
- Time to first token
- 75.27s
- AA index per $ (blended)
- 6.75
Default TTFT includes thinking time at the highest reasoning setting; low-effort settings respond much faster.
| Benchmark | Best score | Source | Date |
|---|---|---|---|
| SWE-bench Verified | 74.8% | independent | 2026-02-25 |
| Terminal-Bench 2.0 | 78.4% | official | 2026-02-05 |
05Price changes we recorded
All price changes →From our daily re-checks of the sources above.
No price change recorded since we started tracking (2026-10-10).
06More from OpenAI
FAQ
How much does the GPT-5.3 Codex API cost?
On the official pricing page: $1.75 / $14 per 1M input / output tokens, cached input $0.175 (checked 2026-10-22).
What is the context window of GPT-5.3 Codex?
400K tokens of context, up to 128K output tokens. Platforms may cap it lower – see the table.
Is GPT-5.3 Codex open source?
No. It is only available through APIs and the vendor’s apps.