WhichAI / Models / Claude Sonnet 4.5

Claude Sonnet 4.5

· verified October 3, 2026

public paid api vision long-context

Provider

Statuspublic

AA Intelligence Index20.7 (official, read October 3, 2026)

Released2025-09-29

Context window1M

ModalitiesText + image + files

API price $/1M (in / out)$3 / $15 (OpenRouter)

Speedn/a

AccessAPI $3/$15 per 1M tokens on OpenRouter · listed September 29, 2025

In one line

Claude Sonnet 4.5 by Anthropic, measured by Artificial Analysis at 20.7 on the Intelligence Index, 52.1 on coding and 15.8 on agentic work. Added to WhichAI automatically from live data on October 3, 2026: no editorial review yet, so judge it by the numbers, not by a verdict. OpenRouter's description: “Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows.”

Alternatives worth a look

GPT-5.4 nano (OpenAI) · AA 20.7API (cheapest OpenAI tier)
Ling 3.0 Flash (Ant Group) · AA 20.1API $0.021/$0.063 per 1M tokens on OpenRouter · open weights · listed July 23, 2026
Qwen3.6-27B (Alibaba) · AA 21.4Open weights (Apache 2.0) · runs on a good desktop

Open Claude's official app ↗ Open in the WhichAI app Not sure? Take the 30-second finder

Artificial Analysis Intelligence Index, official scale (the number published on artificialanalysis.ai), relayed by OpenRouter and refreshed automatically: last read October 3, 2026. 97 models carry a current official measurement. A value marked ~ is converted from an earlier snapshot because no current measurement is published; an unmeasured model is never ranked. Context, price, modality and listing dates come from the public OpenRouter model list (refreshed automatically on the live site; static copy retrieved October 3, 2026) and vendor pages. Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (Model guide and About > Methodology).