Claude Sonnet 4.5
Anthropic released 2025-09-29 proprietary
Gemini 3.7 Flash is both better and cheaper.
It scores +18.6 higher and costs 88% less ($0.750/M against $6.00/M) on this workload — and it does everything this model does.
GLM 5.3 is cheaper still (64% less) but drops no image, file input.
The same model via batch is 50% cheaper ($3.00/M) — same weights, different latency.
Every price dimension
| Input | $3.00/M |
|---|---|
| Output | $15.00/M |
| Cached input | $0.300/M |
| Cache write | $3.75/M |
| Cache write 1h | $6.00/M |
| Web search | $0.01/call |
| Batch discount | 50% |
Independent scores
| Intelligence | 37.4 |
|---|---|
| Coding | 52.1 |
| Agentic | 26.4 |
Sources are listed separately rather than averaged. Across the 62 models both have scored they correlate at r = 0.806 — close agreement overall, but four models rank very differently between them, and a blended score would hide exactly those.
Best rankings by task
- asciiart #17of 83 1232
- mobileapps #26of 56 1187
- fullstack #31of 59 1084
- webapps #31of 56 1097
Capability
| Context window | 1M |
|---|---|
| Max output | 64K |
| Input modes | text, image, file |
| Tool use | yes |
| Reasoning | optional |
| Knowledge cutoff | 2025-01-31 |
| Open weights | no |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-08-24 |
| Quality data | verified |
| Cross-checked | vendor page |
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...