Anthropic Claude API cost by model (Haiku, Sonnet, Opus, Fable) for a 10k-user chatbot, from live prices.
Bottom line: cheapest is Anthropic: Claude Haiku 5.5 at about $53.87/month; the median model costs $2,693/month; the most expensive, Anthropic: Claude Fable 5, costs $5,386/month. That is a 100× spread for the same workload.
Scenario: 10,000 monthly users × 30 messages, 600 words in / 150 words out per message.
| Vendor | Model | In $/1M | Out $/1M | Est. monthly cost | Source / check |
|---|---|---|---|---|---|
| Anthropic | Anthropic: Claude Haiku 5.5 | $0.1 | $0.5 | $53.87 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Sonnet 5.5 | $2.0 | $10.0 | $1,077 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Sonnet 5 | $2.0 | $10.0 | $1,077 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Opus 5.5 | $4.0 | $20.0 | $2,155 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Opus 5 | $5.0 | $25.0 | $2,693 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Opus 4.8 | $5.0 | $25.0 | $2,693 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Fable 5.1 | $10.0 | $50.0 | $5,386 | source 2026-10-16 ✔ matches |
| Anthropic | Anthropic: Claude Fable 5 | $10.0 | $50.0 | $5,386 | source 2026-10-16 ✔ matches |
Try the interactive calculators with your own numbers →
Every week: which AI API prices changed, and what it means for your app's bill. Free.
Prices from OpenRouter's public API, cross-checked with InferIndex. No spam.