Short answer
APIVAI sells 19 models through one API key as of 2026-10-07: 11 Claude models from Anthropic and 8 GPT models from OpenAI. Claude models cost 58–66% less than Anthropic's list prices and GPT models up to 86% less than OpenAI's. Prices below are per million tokens; each model's page has its cost per request, code examples and FAQ.
Claude models (Anthropic)
| Model | Model ID | Input / output | Official price | Saving | Context |
|---|---|---|---|---|---|
| Claude Fable 5.1 | claude-fable-5-1 | $4.21 / $21.02 | $10.00 / $50.00 | 58% | 1M |
| Claude Fable 5 | claude-fable-5 | $4.21 / $21.02 | $10.00 / $50.00 | 58% | 1M |
| Claude Opus 5 | claude-opus-5 | $1.74 / $8.69 | $5.00 / $25.00 | 65% | 1M |
| Claude Opus 4.8 | claude-opus-4-8 | $1.74 / $8.69 | $5.00 / $25.00 | 65% | 1M |
| Claude Opus 4.7 | claude-opus-4-7 | $1.74 / $8.69 | $5.00 / $25.00 | 65% | 1M |
| Claude Opus 4.6 | claude-opus-4-6 | $1.74 / $8.69 | $5.00 / $25.00 | 65% | 1M |
| Claude Opus 5.5 | claude-opus-5-5 | $1.39 / $6.96 | $4.00 / $20.00 | 65% | 1M |
| Claude Sonnet 4.6 | claude-sonnet-4-6 | $1.04 / $5.22 | $3.00 / $15.00 | 65% | 1M |
| Claude Sonnet 5.5 | claude-sonnet-5-5 | $0.69 / $3.47 | $2.00 / $10.00 | 66% | 1M |
| Claude Sonnet 5 | claude-sonnet-5 | $0.69 / $3.47 | $2.00 / $10.00 | 66% | 1M |
| Claude Haiku 4.5 | claude-haiku-4-5 | $0.35 / $1.74 | $1.00 / $5.00 | 65% | 1M |
GPT models (OpenAI)
| Model | Model ID | Input / output | Official price | Saving | Context |
|---|---|---|---|---|---|
| GPT-6 Astra | gpt-6-astra | $1.52 / $7.60 | $10.00 / $50.00 | 85% | 1M |
| GPT-5.5 | gpt-5.5 | $0.77 / $4.56 | $5.00 / $30.00 | 85% | 1M |
| GPT-5.6 Sol | gpt-5.6-sol | $0.61 / $3.65 | $4.00 / $20.00 | 85% | 1M |
| GPT-5.6 Terra | gpt-5.6-terra | $0.30 / $1.82 | $2.00 / $12.00 | 85% | 1M |
| GPT-6.1 Sol | gpt-6.1-sol | $0.30 / $1.52 | $2.00 / $10.00 | 85% | 1M |
| GPT-6 Sol | gpt-6-sol | $0.30 / $1.52 | $2.00 / $10.00 | 85% | 1M |
| GPT-5.6 Luna | gpt-5.6-luna | $0.0304 / $0.18 | $0.20 / $1.20 | 85% | 1M |
| GPT-6 Luna | gpt-6-luna | $0.0144 / $0.0768 | $0.10 / $0.50 | 86% | 1M |
Prices are checked against the price list every 6 hours. Claude models work in both the Anthropic Messages and the OpenAI format; GPT models use the OpenAI format. See pricing for cache prices and the API documentation for setup.