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### How is token usage calculated? ### Are there free tiers or trials? ### How do discounts stack? ### What payment methods are accepted?
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502502## Frequently asked questions
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504**How is token usage calculated?**
504### How is token usage calculated?
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506506Tokens are pieces of text that models process. As a rough estimate, 1 token is approximately 4 characters or 0.75 words in English. The exact count varies by language and content type.
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508**Are there free tiers or trials?**
508### Are there free tiers or trials?
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510510New users receive a small amount of free credits to test the API. [Contact sales](mailto:[email protected]) for information about extended trials for enterprise evaluation.
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512**How do discounts stack?**
512### How do discounts stack?
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514514Batch API and prompt caching discounts can be combined. For example, using both features together provides significant cost savings compared to standard API calls. See [prompt caching pricing](https://platform.claude.com/docs/en/about-claude/pricing#prompt-caching) for how the multipliers interact.
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516**What payment methods are accepted?**
516### What payment methods are accepted?
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518518Major credit cards are accepted for standard accounts. Enterprise customers can arrange invoicing and other payment methods.
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241241 <HomeSection>
242242 <HomeSectionHeader label="Models" title="The Claude model family" description="Choose the right model for your use case." />
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244 <HomeModelCards>
245 <HomeModelCard name="Fable 5" badge="Most capable" modelId="claude-fable-5" description="Highest capability for the most demanding reasoning and long-horizon agentic work." href="https://platform.claude.com/docs/en/models/fable-5/overview" />
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247 <HomeModelCard name="Opus 5" badge="Advanced" modelId="claude-opus-5" description="Excellent for complex analysis, coding, and creative tasks requiring deep reasoning." href="https://platform.claude.com/docs/en/models/opus-5/overview" />
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249 <HomeModelCard name="Sonnet 5" badge="Best balance" modelId="claude-sonnet-5" description="Ideal balance of intelligence and speed for most production workloads." href="https://platform.claude.com/docs/en/models/sonnet-5/overview" />
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251 <HomeModelCard name="Haiku 4.5" badge="Fastest" modelId="claude-haiku-4-5" description="Lightning-fast responses for high-volume, latency-sensitive applications." href="https://platform.claude.com/docs/en/models/haiku-4-5/overview" />
252 </HomeModelCards>
244 * [Claude Fable 5](https://platform.claude.com/docs/en/models/fable-5/overview) (`claude-fable-5`) — *Next-generation intelligence for long-running agents* — Most capable · Research · Multi-day tasks
245 * [Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5/overview) (`claude-opus-5`) — New — *For complex agentic coding and enterprise work* — Complex projects · Agents · Coding
246 * [Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) (`claude-sonnet-5`) — *The best combination of speed and intelligence* — Everyday tasks · Writing · Cost-efficient
247 * [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) (`claude-haiku-4-5`) — *The fastest model with near-frontier intelligence* — Fastest · Lowest cost · High volume
253248 </HomeSection>
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255250 <HomeSection last>