GPT 5.3 Codex API Pricing
GPT 5.3 Codex has tracked API rates of $1.75 per 1M input tokens and $14.00 per 1M output tokens. Cached input is billed at $0.175 per 1M tokens. Rates are in USD from the AI IQ dataset; see the GPT 5.3 Codex model profile for capability scores.
Price List
| Rate | Price (USD) | Notes |
|---|---|---|
| Input | $1.75 | per 1M tokens |
| Output | $14.00 | per 1M tokens |
| Cached input (read) | $0.175 | per 1M tokens |
| Blended input + output | $15.75 | 1M in + 1M out at list price |
| Context window | 400K tokens |
Pricing References and Billing Caveats
These are the tracked rates, not a live quote. Hosted-provider choice, region, long-context tiers, caching, batch discounts, and temporary promotions can change the actual bill. Open-weight availability does not mean hosted inference is free. Workload examples assume the listed standard input and output rates, with no cache hits or discounts.
OpenAI pricing catalog — check current offerings and rate tiers. This catalog may not list historical models or third-party hosted endpoints.
No model-specific official reference is recorded for this entry. Confirm the current rates directly with your inference provider.
What a Workload Costs
Computed straight from the list prices above — token counts are illustrative workload sizes, not measurements of GPT 5.3 Codex.
| Workload | Cost | Tokens |
|---|---|---|
| Short chat turn | $0.00875 | 1K in / 500 out |
| Summarize a long document | $0.203 | 100K in / 2K out |
| Agentic coding session | $2.27 | 500K in / 100K out |
| 1M input + 1M output tokens | $15.75 | 1M in / 1M out |
Effective Cost
In AI IQ's scoring, GPT 5.3 Codex's list price is adjusted by a token-usage multiplier of 1.179, giving an effective cost of $18.57 per 1M input + output tokens. That places it #124 of 155 models on the effective-cost ranking (lower is cheaper). Some models spend far more tokens than others on the same task, so effective cost compares what a unit of work really costs. Method details are on the methodology page; see all models on the cost charts and the falling cost of intelligence over time.
Cheaper Alternatives at Similar Capability
Models with a lower effective cost that score within a few IQ points of GPT 5.3 Codex (IQ 112), or better.
| Model | Provider | IQ | Effective Cost / 1M |
|---|---|---|---|
| gpt-6.1-sol | OpenAI | 141 | $6.25 |
| gpt-6-sol | OpenAI | 137 | $9.75 |
| DeepSeek V4.1 Flash 1017 | DeepSeek | 129 | $2.40 |
| Gemini 3.8 Flash | 129 | $7.91 | |
| gpt-5.6-terra | OpenAI | 129 | $13.62 |
| gemini-3.7-flash | 127 | $5.95 |