Cheapest GPT APIs
The cheapest ways to call OpenAI's GPT models, including the open-weight gpt-oss family that many providers host for a fraction of OpenAI's own prices. Ranked by combined input and output price per million tokens.
Ranking 50 options · updated October 4, 2026
| # | Model | Provider | Input /1M | Output /1M |
|---|---|---|---|---|
| 1 | gpt-oss-20b open | OpenRouter | $0.018 | $0.090 |
| 2 | gpt-oss-20b open | DeepInfra | $0.030 | $0.140 |
| 3 | gpt-oss-20b open | Parasail | $0.030 | $0.150 |
| 4 | GPT-6 Luna | KIE AI | $0.030 | $0.150 |
| 5 | gpt-oss-20b open | Novita AI | $0.040 | $0.150 |
| 6 | GPT OSS 120B open | DeepInfra | $0.037 | $0.170 |
| 7 | GPT OSS 120B open | OpenRouter | $0.037 | $0.170 |
| 8 | GPT OSS 120B open | WaveSpeed AI | $0.037 | $0.170 |
| 9 | GPT OSS 120B open | Novita AI | $0.050 | $0.250 |
| 10 | GPT OSS 120B open | Venice AI | $0.070 | $0.300 |
| 11 | gpt-oss-20b open | Groq | $0.075 | $0.300 |
| 12 | GPT-5.6 Luna | KIE AI | $0.056 | $0.336 |
| 13 | GPT-5 Nano | Replicate | $0.050 | $0.400 |
| 14 | GPT-5 Nano | OpenRouter | $0.050 | $0.400 |
| 15 | GPT-5 Nano | OpenAI | $0.050 | $0.400 |
| 16 | GPT-5 Nano | WaveSpeed AI | $0.050 | $0.400 |
| 17 | GPT-4.1 Nano | OpenRouter | $0.100 | $0.400 |
| 18 | gpt-oss-20b open | Cloudflare Workers AI | $0.200 | $0.300 |
| 19 | GPT-4.1 Nano | OpenAI | $0.100 | $0.400 |
| 20 | GPT-4.1 Nano | WaveSpeed AI | $0.100 | $0.400 |
| 21 | GPT-6 Luna | OpenRouter | $0.100 | $0.500 |
| 22 | GPT-6 Luna Pro | OpenRouter | $0.100 | $0.500 |
| 23 | GPT-6 Luna | Atlas Cloud | $0.100 | $0.500 |
| 24 | GPT-6 Luna | OpenAI | $0.100 | $0.500 |
| 25 | GPT-6 Luna | WaveSpeed AI | $0.100 | $0.500 |
| 26 | GPT-4o Mini | Replicate | $0.150 | $0.600 |
| 27 | GPT-4o Mini | OpenRouter | $0.150 | $0.600 |
| 28 | GPT-4o Mini | OpenAI | $0.150 | $0.600 |
| 29 | GPT OSS 120B open | Fireworks AI | $0.150 | $0.600 |
| 30 | GPT OSS 120B open | Nebius | $0.150 | $0.600 |
| 31 | GPT OSS 120B open | Groq | $0.150 | $0.600 |
| 32 | GPT OSS 120B open | Together AI | $0.150 | $0.600 |
| 33 | GPT-6 Luna | Venice AI | $0.125 | $0.625 |
| 34 | GPT-4o Mini | WaveSpeed AI | $0.150 | $0.600 |
| 35 | GPT OSS 120B open | Sambanova | $0.220 | $0.590 |
| 36 | GPT OSS 120B open | Parasail | $0.100 | $0.750 |
| 37 | GPT-4o Mini | Venice AI | $0.188 | $0.750 |
| 38 | GPT OSS 120B open | Cerebras | $0.350 | $0.750 |
| 39 | GPT OSS 120B open | Cloudflare Workers AI | $0.350 | $0.750 |
| 40 | GPT-5.6 Luna | Token Harbor | $0.200 | $1.20 |
| 41 | GPT-5.6 Luna Pro | OpenRouter | $0.200 | $1.20 |
| 42 | GPT-5.6 Luna | Atlas Cloud | $0.200 | $1.20 |
| 43 | GPT-5.6 Luna | OpenAI | $0.200 | $1.20 |
| 44 | GPT-5.6 Luna | OpenRouter | $0.200 | $1.20 |
| 45 | GPT-5.6 Luna | WaveSpeed AI | $0.200 | $1.20 |
| 46 | GPT-5.4 Nano | OpenRouter | $0.200 | $1.25 |
| 47 | GPT-5.4 Nano | OpenAI | $0.200 | $1.25 |
| 48 | GPT-5.4 Nano | Atlas Cloud | $0.200 | $1.25 |
| 49 | GPT-5.4 Nano | WaveSpeed AI | $0.200 | $1.25 |
| 50 | GPT-5.6 Luna | Venice AI | $0.250 | $1.50 |