Anthropic·anthropic/claude-sonnet-4.5
Claude Sonnet 4.5 is ModelCap archive rank #49 (Measured), from the ModelCap Index as of 22 Sept 2026, 02:49 UTC.
Claude Sonnet 4.5 listed OpenRouter input price is $3.00 per 1M tokens and listed output price is $15.00 per 1M tokens, from OpenRouter listed prices as of 22 Sept 2026, 02:49 UTC.
Claude Sonnet 4.5 has a published context limit of 1M tokens in the ModelCap catalogue as of 22 Sept 2026, 02:49 UTC.
Claude Sonnet 4.5 has 7 published OpenRouter serving endpoints, from OpenRouter as of 22 Sept 2026, 02:49 UTC.
Claude Sonnet 4.5 weight access is api only, from ModelCap classification of published repository metadata as of 22 Sept 2026, 02:49 UTC.
Snapshot facts · download the public dataset · methodology
Superseded by Claude Sonnet 5. It no longer holds a current-board position; its all-versions archive rank is #49.
Published Max, X-High, High and other configurations for this model. These are sourced scores, not head-to-head essays.
BES normalizes admitted public benchmark evidence for measured Index rows. Its legacy score and observables prior do not define the public language rank.
These adoption and deployment observations remain context only. They do not change this model's ModelCap Index score or rank.
The bounded 0–100 capability score blends each source’s competitive placement with its published achievement, then combines capability families. Evidence breadth adds a modest uncertainty adjustment; price and popularity are not part of benchmark-led rank.
Missing: artifactReproducibility.revision-sha, artifactReproducibility.architecture-and-model-type, artifactReproducibility.parameter-count, artifactReproducibility.serialized-weight-format, artifactReproducibility.base-lineage, accessLegalClarity.declared-license, accessLegalClarity.resolvable-license-terms, evaluationProvenance.evaluation-dataset-revisions.
A metadata completeness and deployability index—not a safety certification, quality grade, or production-readiness claim.
Market Gravity uses OpenRouter’s full-catalogue popularity order. Sparse Vercel top-ten observations appear only when published and do not affect the score.
OpenRouter weekly popularity across the full model catalogue.
Independent providers versus the model's open or closed cohort, weighted by uptime.
Hugging Face 30-day downloads for open models; neutral for closed models.
Time since first public availability, on a six-month half-life.
Claude Sonnet 4.5 is a superseded version and is not on the current board as of 22 September 2026. Its archive position, where one exists, is shown on the page; the newer version carries the current rank.
Claude Sonnet 4.5 is listed at $3.00 per 1M input tokens and $15.00 per 1M output tokens as of 22 September 2026 across 5 providers. Prices come from the OpenRouter catalogue and re-observe on every refresh. For 1,000 requests using 2,000 input and 500 output tokens each, the listed rates imply $13.50 total (2M input + 0.5M output). This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the chosen endpoint's rate and limits before budgeting.
Claude Sonnet 4.5 has a published context window of 1M tokens (1,000,000) and a maximum output of 64K tokens. Individual providers can serve less than the published maximum; the providers table lists each endpoint's own limit.
API only. No downloadable model weights are linked in the current source data; access is through a hosted API or product.
5 providers serve Claude Sonnet 4.5 through OpenRouter as of 22 September 2026: Claude Platform on AWS, Azure, Amazon Bedrock, Anthropic and Google. Each provider's price, context limit, quantization and measured uptime are in the providers table above.
Claude Sonnet 4.5 has published results on 4 public boards tracked by ModelCap as of 22 September 2026: Arena coding 1520 (#31 of 397), ARC-AGI-2 13.6% (#105 of 214), SWE-bench 71.4% (#11 of 47) and BFCL V4 73.2 (#2 of 83). Each board page ranks every tracked model on that benchmark; the ModelCap Index combines them with published uncertainty.
Claude Sonnet 4.5 first appeared in the catalogue on 29 Sept 2025, with a published knowledge cutoff of 2025-01-31. It has since been superseded by Claude Sonnet 5. Rank and price movements since then are recorded on the site's changes feed.