Last updated:
AI model API pricing, compared
Every model we track, at list price per 1M tokens, and what the same coding workload costs on each. Prices are checked on the vendor pages.
API cost per task, model by model
Pick a codebase size and how many agent tasks you run a month. The table prices the same workload on every model at list price.
| Model | Input / output per 1M | Per task | Per month |
|---|
Same assumptions as the calculator (60% of input from cache). Newer models often use fewer tokens per task, so treat this as a like-for-like list-price comparison.
Price list
| Model | Released | Input | Cache hit | Output | Context | Source |
|---|---|---|---|---|---|---|
| Claude Sonnet 5.5 Anthropic | Sep 28, 2026 | $2 | $0.20 | $10 | 1M | Official |
| Claude Opus 5.5 Anthropic | Sep 22, 2026 | $4 | $0.20 | $20 | 1M | Official |
| Claude Fable 5.1 Anthropic | Sep 1, 2026 | $10 | $0.25 | $50 | — | Official |
| Claude Haiku 4.5 Anthropic | Oct 15, 2025 | $1 | $0.10 | $5 | 200K | Official |
| GPT-6.1 Sol OpenAI | Sep 29, 2026 | $2 | $0.10 | $10 | — | Official |
| GPT-6 Sol OpenAI | Sep 22, 2026 | $2 | $0.60 | $10 | — | Official |
| GPT-6 Luna OpenAI | Sep 22, 2026 | $0.10 | $0.01 | $0.50 | — | Official |
| GPT-6 Astra OpenAI | Sep 4, 2026 | $10 | $1 | $50 | 1.05M | Official |
Which model for what
- Everyday agentic coding: Claude Sonnet 5.5 or GPT-6.1 Sol. Both list at $2 / $10.
- Hardest long-running work: Claude Opus 5.5 ($4 / $20) or GPT-6 Astra ($10 / $50).
- Cheap high-volume jobs: GPT-6 Luna or Claude Haiku 4.5.
- Claude Fable 5.1 is Anthropic's top tier at $10 / $50; Anthropic says Opus 5.5 matches it on most work for less.
Announced or rumored, not available
- Claude Haiku 5.5: announced on 2026-09-22 to follow "in the coming weeks". No price yet.
- GPT-6.1 Astra: reported as held back over safety concerns (late September 2026). No public API.
- Claude Fable 5.5: no such model. The newest Fable is 5.1.
Claude Sonnet 5.5 · Claude Opus 5.5 · Sonnet 5.5 vs Opus 5.5 · GPT-6 Sol · GPT-6 Astra · Opus 5.5 vs GPT-6 Astra · Opus 5.5 vs Fable 5.1 · Cost calculator
FAQ
What is Claude 5.5?
Not a single model. "Claude 5.5" is the family released in September 2026: Opus 5.5 (2026-09-22) and Sonnet 5.5 (2026-09-28), with Haiku 5.5 announced but not out yet.
Which AI model is cheapest for coding?
Per token, GPT-6 Luna and Claude Haiku 4.5. For agent coding quality per dollar, Sonnet 5.5 and GPT-6.1 Sol at $2 / $10 are the usual picks. Use the table above with your own task count.
Is GPT-6.1 Sol cheaper than GPT-6 Sol?
Same input and output price ($2 / $10), but cheaper cache hits: $0.10 per 1M against $0.60.
Independent site, not affiliated with Anthropic, OpenAI or Meta. USD list prices before tax.