OpenAI API Pricing 2026
The most widely-used LLM API. GPT-5.5 and GPT-5.4 are the current frontier tiers; o3-pro and o4-mini lead the reasoning tier. OSS 120B offers open-source quality at near-free pricing.
Pricing verified 2026-08-03. Sourced from platform.openai.com/docs/pricing.
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Prices in USD per 1M tokens
| Model | Input / 1M | Output / 1M | Context |
|---|---|---|---|
GPT-5.6 Luna OpenAI cost-sensitive GPT-5.6 tier; 1.05M context | $0.2 | $1.2 | 1,050,000 |
GPT-5.6 Sol OpenAI flagship for complex professional work; 1.05M context | $5 | $30 | 1,050,000 |
GPT-5.6 Terra OpenAI balanced GPT-5.6 tier; 1.05M context | $2 | $12 | 1,050,000 |
GPT-5.5 Latest OpenAI frontier model; 272K context standard tier | $5 | $30 | 272,000 |
GPT-5.5 Pro GPT-5.5 Pro; 1M context; max capability tier | $30 | $180 | 1,050,000 |
GPT-5.4 Strong coding & professional workloads; 272K context standard tier | $2.5 | $15 | 272,000 |
GPT-5.4 Mini Best mini model for coding, computer use, and subagents | $0.75 | $4.5 | 272,000 |
GPT-5.4 Nano Ultra-low-cost GPT-5.4 tier for classification and routing | $0.2 | $1.25 | 272,000 |
GPT-5.4 Pro GPT-5.4 Pro; 1M context; enterprise workloads | $30 | $180 | 1,050,000 |
GPT-5 Pro GPT-5 Pro; 400K context; heavy inference | $15 | $120 | 400,000 |
o3 Deep Research o3 with deep-research mode; extended reasoning budget | $10 | $40 | 200,000 |
o4 Mini Deep Research o4-mini deep-research; cost-effective research tasks | $2 | $8 | 200,000 |
GPT-5 Codex GPT-5 Codex; 400K context; coding-optimized | $1.25 | $10 | 400,000 |
GPT-5 Mini Previous-gen budget model; GPT-5.4 Mini is the current mini tier | $0.25 | $2 | 128,000 |
GPT-5 Previous flagship; use GPT-5.5 for new projects | $1.25 | $10 | 128,000 |
GPT-5 Nano GPT-5 Nano; 400K context; ultra-cheap classification & routing | $0.05 | $0.4 | 400,000 |
gpt-oss-120b OpenAI open-source 120B; runs on Groq/Together at low cost | $0.04 | $0.17 | 131,072 |
o3 Pro o3 Pro; extended thinking compute; top-tier reasoning | $20 | $80 | 200,000 |
GPT-4.1 Previous production tier with 1M context; superseded by GPT-5.4 | $2 | $8 | 1,000,000 |
GPT-4.1 Mini Previous mid-tier; 1M context window | $0.4 | $1.6 | 1,000,000 |
GPT-4.1 Nano Previous budget tier; GPT-5.4 Nano is cheaper for new workloads | $0.1 | $0.4 | 1,000,000 |
o3 Flagship reasoning; use when o4-mini accuracy is insufficient | $2 | $8 | 200,000 |
o4-mini Best-value reasoning model; chain-of-thought built in | $1.1 | $4.4 | 200,000 |
o1-pro OpenAI reasoning model; verify current availability in the official rate card | $150 | $600 | 200,000 |
o3 Mini OpenAI reasoning mini model; verify current availability in the official rate card | $1.1 | $4.4 | 200,000 |
o1 OpenAI reasoning model; verify current availability in the official rate card | $15 | $60 | 200,000 |
GPT-4o-mini OpenAI budget model; verify current availability in the official rate card | $0.15 | $0.6 | 128,000 |
How to read these estimates
The monthly table assumes 70% input tokens and 30% output tokens. It is a consistent comparison baseline, not a prediction of your workload. Actual bills can also include cached-input discounts, batch pricing, tool calls, minimum charges, regional differences, retries, and taxes.
The linked source is the provider's pricing documentation. Verify the current rate card and model availability before committing to a budget.
Estimated Monthly Cost (70% input / 30% output split)
| Model | 1M tokens/mo | 10M tokens/mo | 100M tokens/mo | 1B tokens/mo |
|---|---|---|---|---|
| GPT-5.6 Luna | $0.500 | $5.00 | $50.00 | $500 |
| GPT-5.6 Sol | $12.50 | $125 | $1,250 | $12,500 |
| GPT-5.6 Terra | $5.00 | $50.00 | $500 | $5,000 |
| GPT-5.5 | $12.50 | $125 | $1,250 | $12,500 |
| GPT-5.5 Pro | $75.00 | $750 | $7,500 | $75,000 |
| GPT-5.4 | $6.25 | $62.50 | $625 | $6,250 |
| GPT-5.4 Mini | $1.87 | $18.75 | $188 | $1,875 |
| GPT-5.4 Nano | $0.515 | $5.15 | $51.50 | $515 |
| GPT-5.4 Pro | $75.00 | $750 | $7,500 | $75,000 |
| GPT-5 Pro | $46.50 | $465 | $4,650 | $46,500 |
| o3 Deep Research | $19.00 | $190 | $1,900 | $19,000 |
| o4 Mini Deep Research | $3.80 | $38.00 | $380 | $3,800 |
| GPT-5 Codex | $3.88 | $38.75 | $388 | $3,875 |
| GPT-5 Mini | $0.775 | $7.75 | $77.50 | $775 |
| GPT-5 | $3.88 | $38.75 | $388 | $3,875 |
| GPT-5 Nano | $0.155 | $1.55 | $15.50 | $155 |
| gpt-oss-120b | $0.079 | $0.790 | $7.90 | $79.00 |
| o3 Pro | $38.00 | $380 | $3,800 | $38,000 |
| GPT-4.1 | $3.80 | $38.00 | $380 | $3,800 |
| GPT-4.1 Mini | $0.760 | $7.60 | $76.00 | $760 |
| GPT-4.1 Nano | $0.190 | $1.90 | $19.00 | $190 |
| o3 | $3.80 | $38.00 | $380 | $3,800 |
| o4-mini | $2.09 | $20.90 | $209 | $2,090 |
| o1-pro | $285 | $2,850 | $28,500 | $285,000 |
| o3 Mini | $2.09 | $20.90 | $209 | $2,090 |
| o1 | $28.50 | $285 | $2,850 | $28,500 |
| GPT-4o-mini | $0.285 | $2.85 | $28.50 | $285 |
Frequently Asked Questions
How much does OpenAI LLM API cost?
OpenAI offers 27 models ranging from $0.040/1M to $150.00/1M input tokens. The most widely-used LLM API. GPT-5.5 and GPT-5.4 are the current frontier tiers; o3-pro and o4-mini lead the reasoning tier. OSS 120B offers open-source quality at near-free pricing.
Is OpenAI cheaper than self-hosting?
For low-volume workloads (under 100M tokens/month), cloud APIs like OpenAI are almost always cheaper than purchasing and maintaining GPU hardware. Use our calculator to find the exact break-even point for your usage.