OpenAI API API pricing
The default LLM API most teams reach for first, with the deepest docs, tooling, and third-party ecosystem.
No free tierBilled per token·Verified Jun 27, 2026
Free tier
$5 trial credit (after ID verification); opt-in data-sharing free tokens
Plans and prices
| Plan | Price | What it covers |
|---|---|---|
| GPT-5.5 (flagship) | $5.00 / $30.00 per 1M tokens | Input / output; cached input $0.50/1M. Highest-intelligence model (AA Index 55). |
| GPT-5.4 | $2.50 / $15.00 per 1M tokens | Input / output; cached input $0.25/1M. Mid-tier flagship. |
| GPT-5.4-mini | $0.75 / $4.50 per 1M tokens | Input / output; cached input $0.075/1M. Cost-efficient general model. |
| GPT-5.4-nano | $0.20 / $1.25 per 1M tokens | Input / output; cached input $0.02/1M. Cheapest, lowest-latency tier (~0.56s TTFT). |
| Batch / Flex processing | Up to ~50% off standard | Asynchronous Batch API and Flex tier trade latency for substantially lower per-token cost. |
| Scale Tier | Custom / committed throughput | Prioritized compute with a contractual 99.9% uptime SLA for production traffic. |
What to watch for on the bill
- Expensive output tokens on flagship models ($30/1M on GPT-5.5) make high-volume generation costly
- Standard pay-as-you-go tier has no uptime SLA; guarantees require Scale Tier or Azure
- Recurring billing-transparency and credit-reconciliation complaints from users
- New/low-tier accounts hit restrictive rate limits and quota-ramp friction
The pricing page, as we saw it
Source: https://developers.openai.com/api/docs/pricing. Prices change. Confirm on the vendor page before you commit.
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