Source page: https://www.o10.io/models/claude-sonnet-4.5 Plain-text reference for reading, copying, and citation. Examples are illustrative; use your own credentials for API requests. Model data: https://www.o10.io/api/models.json Content index: https://www.o10.io/llms.txt Prices are dated references, not live quotes. Check the current endpoint rate before use. # Claude Sonnet 4.5. Price, context, and routing Claude Sonnet 4.5 costs $3.00/1M input tokens and $15.00/1M output tokens as of 2026-06-27. Anthropic publishes this model with a 1M tokens context window. o10 lists Claude Sonnet 4.5 on Anthropic at routing band C4. API slug claude-sonnet-4.5. Verify list prices against the venue you call. ## Key takeaways ### What is Claude Sonnet 4.5? Claude Sonnet 4.5 is a chat model from anthropic (slug: claude-sonnet-4.5). Pick Claude Sonnet 4.5 when you need Anthropic's mid-frontier coding and writing tier. It is the default Claude workhorse: cheaper than Opus, stronger than Haiku on long-context agent work. Published input pricing starts at $3.00/1M tokens. Context window: 1M tokens. *Catalog snapshot 2026-06-27.* ### When should you pick Claude Sonnet 4.5? Pick Claude Sonnet 4.5 when you need Anthropic's mid-frontier coding and writing tier. It is the default Claude workhorse: cheaper than Opus, stronger than Haiku on long-context agent work. Claude Sonnet 4.5 sits between Claude Haiku (economy) and Claude Opus (flagship). Move down to Haiku when evals pass at C0/C1; move up to Opus only when the quality floor needs the extra reasoning. ### How does Claude Sonnet 4.5 differ from sibling models? Claude Sonnet 4.5 sits between Claude Haiku (economy) and Claude Opus (flagship). Move down to Haiku when evals pass at C0/C1; move up to Opus only when the quality floor needs the extra reasoning. ### How much does Claude Sonnet 4.5 cost per million tokens? Claude Sonnet 4.5 costs $3.00/1M input tokens and $15.00/1M output tokens in the gateway catalog snapshot (2026-06-27). Endpoint pricing may differ by fulfillment host. *Sourced from gateway catalog snapshot.* ### Where can you run Claude Sonnet 4.5? Claude Sonnet 4.5 is configured on Anthropic. Known host IDs: anthropic: anthropic/claude-sonnet-4-5. This model is routable through o10 eval-gated routing. ### What is Claude Sonnet 4.5's context window? Claude Sonnet 4.5 supports a 1M tokens context window in the gateway catalog snapshot. Context limits may vary by fulfillment host endpoint. ### What o10 routing band is Claude Sonnet 4.5? Claude Sonnet 4.5 is classified at o10 routing band C4. Bands group models by cost tier and eval profile: C0 (economy), C1 (standard), C2 (capable), C3/C4 (frontier). Production routing is enabled for this slug. ### Who makes Claude Sonnet 4.5? Claude Sonnet 4.5 is attributed to source provider anthropic in the o10 catalog. Fulfillment hosts (Anthropic) supply API access; list pricing may differ by venue. ## Citation Claude Sonnet 4.5 costs $3.00/1M input tokens and $15.00/1M output tokens as of 2026-06-27. Anthropic publishes this model with a 1M tokens context window. o10 lists Claude Sonnet 4.5 on Anthropic at routing band C4. API slug claude-sonnet-4.5. Verify list prices against the venue you call. ## Methodology Fulfillment catalog 2026-06-27. Gateway pricing joined where slug match exists. ## FAQ ### How much does Claude Sonnet 4.5 cost? Claude Sonnet 4.5 costs $3.00/1M input tokens and $15.00/1M output tokens in the gateway snapshot (2026-06-27). Verify against your provider's published pricing. ### What is Claude Sonnet 4.5's context window? Claude Sonnet 4.5 supports 1M tokens in the gateway catalog snapshot. Host-specific endpoints may differ. ### Which hosts serve Claude Sonnet 4.5? Claude Sonnet 4.5 (claude-sonnet-4.5) is configured on: Anthropic. Upstream model IDs are listed in the fulfillment routes section. ### Is Claude Sonnet 4.5 routable through o10? Yes. Claude Sonnet 4.5 is routable at band C4. Send model: "claude-sonnet-4.5" or use an o10 smart routing alias. ### How do I call Claude Sonnet 4.5 via o10? Use o10 slug "claude-sonnet-4.5" or gateway ID "anthropic/claude-sonnet-4.5" depending on your integration. Gateway-compatible endpoints accept OpenAI-style /v1 requests. ### How does o10 route this model? o10 routes Claude Sonnet 4.5 only when per-use-case evals clear at your quality floor. Band C4 indicates cost tier. See /kyi for governance and /models/routing for smart aliases. ### What is the API model ID for Claude Sonnet 4.5? The o10 slug is "claude-sonnet-4.5"; the unified gateway ID is "anthropic/claude-sonnet-4.5". Host IDs: anthropic: anthropic/claude-sonnet-4-5. Pricing snapshot date: 2026-06-27. ### Who hosts Claude Sonnet 4.5? Claude Sonnet 4.5 is hosted as anthropic: anthropic/claude-sonnet-4-5. o10 maps those upstream IDs to slug "claude-sonnet-4.5". ## Related links - [Claude Sonnet 4.5 HTML](https://www.o10.io/models/claude-sonnet-4.5) - [Claude Sonnet 4.5 pricing](https://www.o10.io/pricing/anthropic/claude-sonnet-4.5) - [Model catalog](https://www.o10.io/models) - [llms-models.txt](https://www.o10.io/llms-models.txt) ## Source URL https://www.o10.io/models/claude-sonnet-4.5