OpenAI API Pricing — March 2026
Last updated: March 5, 2026 — GPT-5.4 now rolling out
Latest: GPT-5.4 (March 5, 2026)
- GPT-5.4 brings advances in reasoning, coding, and agentic workflows
- Available in ChatGPT, API, and Codex
- Includes GPT-5.4 Thinking and GPT-5.4 Pro variants
TL;DR — OpenAI API Prices (March 2026)
- GPT-5.2: $1.75/$14.00 per 1M input/output tokens (latest flagship)
- GPT-5: $1.25/$10.00 per 1M tokens
- GPT-5 Nano: $0.05/$0.40 per 1M tokens (cheapest)
- o4-mini: $1.10/$4.40 per 1M tokens (best value reasoning)
- o3-pro: $20.00/$80.00 per 1M tokens (strongest reasoning)
OpenAI offers the widest range of models from cheap fast models to expensive reasoning powerhouses.
GPT-5 Family (Flagship)
| Model | Context | Input / 1M tokens | Output / 1M tokens | Cached Input |
|---|---|---|---|---|
| GPT-5.2 Pro | 200K | $21.00 | $168.00 | $2.10 |
| GPT-5.2 | 200K | $1.75 | $14.00 | $0.175 |
| GPT-5.1 | 128K | $1.25 | $10.00 | $0.125 |
| GPT-5 | 128K | $1.25 | $10.00 | $0.125 |
| GPT-5 Mini | 200K | $0.25 | $2.00 | $0.025 |
| GPT-5 Nano | 128K | $0.05 | $0.40 | $0.005 |
O-Series (Reasoning)
| Model | Context | Input / 1M tokens | Output / 1M tokens | Cached Input |
|---|---|---|---|---|
| o1-pro | 200K | $150.00 | $600.00 | — |
| o3-pro | 200K | $20.00 | $80.00 | — |
| o1 | 200K | $15.00 | $60.00 | $7.50 |
| o3 | 200K | $2.00 | $8.00 | $1.00 |
| o4-mini | 200K | $1.10 | $4.40 | $0.275 |
| o3-mini | 200K | $1.10 | $4.40 | $0.275 |
GPT-4 Family (Previous Gen)
| Model | Context | Input / 1M tokens | Output / 1M tokens | Cached Input |
|---|---|---|---|---|
| GPT-4.1 | 1M | $2.00 | $8.00 | $0.20 |
| GPT-4.1 Mini | 1M | $0.40 | $1.60 | $0.04 |
| GPT-4.1 Nano | 1M | $0.10 | $0.40 | $0.01 |
| GPT-4o | 128K | $2.50 | $10.00 | $1.25 |
| GPT-4o Mini | 128K | $0.15 | $0.60 | $0.075 |
Cost Optimization Tips
- Use Nano/Mini models for simple tasks — 10-50x cheaper
- Prompt caching — 90% off for repeated context (cached = 10% of input price)
- Batch API — 50% off for async processing within 24 hours
- Choose the right model — Don't use o1-pro for simple queries
Related
Related Resources
ResourceLLM API Pricing 2026 — Compare GPT-5, Claude 4, Gemini 2.5, DeepSeek CostsApril 2026: GPT-5.4 $2.50/M, Claude Sonnet $3/$15, Gemini Flash $0.30, DeepSeek $0.14. Compare 30+ LLM prices. Find the cheapest API for your app.ResourceClaude API Pricing (March 2026): Opus $5/M Tokens, Sonnet $3, Haiku $0.25Claude API pricing 2026: Opus $5.00/M input, $25.00/M output. Sonnet $3.00/$15.00, Haiku $0.25/$1.25. Compare all models — Updated March 2026.ResourceDeepSeek API Pricing 2026 — Cheapest LLM ($0.14/M Input)DeepSeek V3.2 API pricing: $0.14/M input, $0.28/M output — the cheapest LLM. 90% cache discount. Compare vs GPT-5.4, Claude 4.6, Gemini 2.5. Free tier.ResourceGemini API Pricing 2026: 2.5 Pro at $1.25/M (Free Tier Available)Gemini API pricing 2026: 2.5 Pro $1.25/M tokens, Flash $0.30/M, 2M context. Best free tier among LLMs. Compare GPT-5, Claude pricing.
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