Anthropic API
Developer API for Claude models with token-based billing, separate from Claude subscriptions.
At a Glance
Anthropic API is an AI tool for Agent & RAG frameworks (category: Development & Code). Free access: No free plan published. Documented: 9 plans with prices and limits.
- Category
- Agent & RAG frameworks
- Paid from
- $2 / $10 / per 1M input/output tokens (Claude Sonnet 5.5)
- Free Option
- No free plan published
- Plans
- 9
- Sources
- 5 verified sources
Category: Development & Code · Agent & RAG frameworks
Features
The Anthropic API provides Claude models for custom applications and bills per token. This entry keeps API rates clearly separate from the already-listed Claude consumer subscriptions.
Claude Managed Agents (hosted agent sessions) bills the same model token rates plus $0.08 per session-hour, charged only while the session status is "running".
Claude Mythos 5.1 is invite-only (Project Glasswing) and costs the same as Fable 5.1: $10 input and $50 output per million tokens; cache reads $0.25 per million tokens, batch $5/$25.
Claude Opus 5.5 is on the token price list at $4 input and $20 output per million tokens; Opus 5 stays $5 / $25.
Claude Sonnet 5.5 is listed under Latest models at $2 input and $10 output per million tokens. Sonnet 5 stays under Legacy at the same price.
- Sonnet 5.5: $2 input and $10 output per million tokens; Sonnet 5 stays the same
- Opus 5.5: $4 / $20; Opus 5: $5 / $25; Haiku 4.5: $1 / $5 per million tokens
- Mythos 5.1 (invite only): $10/$50 per million tokens, cache read $0.25
- Managed Agents runtime: $0.08 per session-hour plus model tokens
Prices and plans
| Tier | Price | Period | What you get |
|---|---|---|---|
| Claude Sonnet 5.5 | $2 / $10 | per 1M input/output tokens | $2 input and $10 output per MTok. Listed under Latest models. Cache writes: $2.50 (5 min) / $4 (1 hr) per MTok; cache reads: $0.10 per MTok. Sonnet 5 stays under Legacy at $2 / $10. |
| Claude Sonnet 5 | $2 / $10 | per 1M input/output tokens | $2 input and $10 output per MTok Standard price; the announced increase will not occur |
| Claude Fable 5.1 | $10 / $50 | per 1M input/output tokens | $10 input and $50 output per million tokens Cache reads: $0.25 per million tokens |
| Claude Opus 5.5 | $4 / $20 | per 1M input/output tokens | $4 input and $20 output per MTok. Opus 5 stays $5 / $25 and is not replaced. Cache writes: $5 (5 min) / $8 (1 hr) per MTok; cache reads: $0.20 per MTok. Fast mode (research preview, Claude API only): $8 / $40 across the full context window. |
| Claude Opus 5 | $5 / $25 | per 1M input/output tokens | $5 input and $25 output per MTok Cache writes: $6.25 (5 min) / $10 (1 hr) per MTok; cache reads: $0.50 per MTok Fast mode (research preview, Claude API only): $10 input / $50 output per MTok across the full context window |
| Claude Haiku 5.5 | $0.10 / $0.50 | per 1M input/output tokens | Prompts up to 100,000 tokens: $0.10 input and $0.50 output per MTok. Cache writes: $0.125 (5 min) / $0.20 (1 hr) per MTok; cache reads: $0.01 per MTok. Prompts over 100,000 tokens: $0.50 input and $2.50 output per MTok. Cache writes: $0.625 (5 min) / $1 (1 hr) per MTok; cache reads: $0.05 per MTok. Batch: $0.05 input and $0.25 output per MTok up to 100,000 tokens, and $0.25 input and $1.25 output per MTok above that. Haiku 4.5 stays at $1 / $5. |
| Claude Haiku 4.5 | $1 / $5 | per 1M input/output tokens | $1 input and $5 output per MTok Cache writes: $1.25 (5 min) / $2 (1 hr) per MTok; cache reads: $0.10 per MTok |
| Claude Mythos 5.1 (invite only) | $10 / $50 | per 1M input/output tokens | $10 input and $50 output per million tokens; invite only / Project Glasswing Cache reads: $0.25 per million tokens; batch $5/$25; limited availability, not GA |
| Claude Managed Agents Runtime | $0.08 | per session-hour | $0.08 per session-hour, only while status is running, metered in milliseconds Model tokens at standard rates; container hours not billed on top; idle/rescheduling/terminated not charged |
Prices per vendor, excl. taxes/VAT where applicable.
Limits
API billing is separate from Claude consumer subscriptions. For Fable 5.1, cache reads cost $0.25 per million tokens.
Alternatives and similar tools to Anthropic API
Anthropic API alternatives comparison →
FAQ
Is Anthropic API available for free?
No. No free access is published on the vendor's own pages.
Where is the vendor of Anthropic API based?
Anthropic, PBC is based in the USA. Regardless of that location, data processing and privacy terms are governed by the vendor's own contract.
How is Anthropic API billed?
API billing is separate from Claude consumer subscriptions. For Fable 5.1, cache reads cost $0.25 per million tokens. Sonnet 5.5 costs $2 input and $10 output per million tokens; Sonnet 5 stays listed at the same price. Haiku 5.5 costs $0.10 input and $0.50 output per million tokens for prompts up to 100,000 tokens.
What plans does Anthropic API offer?
The catalog documents 9 plans with price, billing period, and included features.
Is Anthropic API currently available?
Anthropic API is still active: Active.
How we compare
We compare free access, paid entry, plan limits, features and the listed official sources. Unsourced figures stay marked as not published.
Only confirmed entries appear in the catalog. Prices, plans and limits come from listed official vendor pages. Missing figures stay marked as not published. Search results are ordered by Task match by default; category and task lists are alphabetical. Both can be switched to Free access first; neither is a quality ranking. The vendor page always wins.
Edited and checked by the AI Compare Ninja team
Sources
All details regarding plans, limits, and features are based on official vendor documentation and the primary sources verified below.
- https://platform.claude.com/docs/en/about-claude/pricing
- https://platform.claude.com/docs/en/models/mythos-5-1/overview
- https://www.anthropic.com/claude-fable-and-mythos-5-1
- https://claude.com/pricing
- https://www.anthropic.com/pricing
Visit site (opens in a new tab)
Spotted an outdated figure? Vendor pages change without notice. Report an error