Claude Sonnet 4.5 (claude-sonnet-4-5-20250929) is a chat model from anthropic with a 200K-token context window; proprietary (API-only); capabilities vision, tools, reasoning; input image, pdf, text; output text.
200KContext
64KMax output
$3$ / 1M in
19.3Intelligence
39.62tok / s
Pricing
Input
$3 / 1M tokens
Output
$15 / 1M tokens
Currency
USD
Note
Indicative US list price — verify with the vendor.
Indicative US list price — a reference only, verify with the vendor. Source: litellm. Last verified 2026-07-22.
Benchmarks
Intelligence index
19.3
Math
37
Cited from a public third-party leaderboard — a reference, verify at the source. Source: Artificial Analysis. Last verified 2026-09-26.
Performance
Throughput
39.62 tokens/s
Latency (TTFT)
1.04 s
Cited speed metrics — a reference, verify at the source. Source: Artificial Analysis. Last verified 2026-11-05.