Anthropic
Claude Sonnet 5.5
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing...
Cost / 1M tokens
High usage$2.00
input
$0.10
cached input
$10.00
output
Context Window
1M
Up to 128K max output
Modalities
text, image, file → text
Claude tokenizer
Quickstart & API
anthropic/claude-sonnet-5.5Best for & Strengths
Key Strengths
Recommended Workloads in ChatOSS
- Daily agentic coding
- Full-stack feature delivery
- Code migrations & upgrades
Verified Evaluations
Benchmarks & Frontier Comparison
How Claude Sonnet 5.5 compares against leading open-weight and proprietary frontier models across independent agentic coding and reasoning suites.
| Benchmark (Metric) | Claude Sonnet 5.5 | DeepSeek V4.1 Flash | GLM 5.3 | Kimi K3.1 Pro | Claude Opus 5.5 |
|---|---|---|---|---|---|
| Agentic & Software Engineering | |||||
| ChatOSS Agentic Coding Index (%) | 74.3% | 63.2% | 58.3% | 65% | 74.1% |
| SWE-Bench Verified (%) | — | 91.5% | 95.4% | 94.8% | 97% |
| DeepSWE v1.1 (Pass@1 %) | 71% | 77% | 69% | 73.5% | 74.2% |
| Vibe Code Bench v1.1 (%) | 92.39% | 87.7% | 78.1% | 88.4% | 90.3% |
| Terminal-Bench 4.0 (%) | 64.14% | 42.3% | 42% | 46.2% | 65.2% |
| Code Migration (%) | 69.83% | 45.6% | 44.2% | 52% | 66.7% |
| Intelligence & Token Economics | |||||
| Artificial Analysis Intelligence Index (0–100) | 56 | 39.5 | 44.8 | 55.1 | 57.6 |
| Input Price (/ 1M tokens) | $2.00 | $0.15 | $1.40 | $2.00 | $4.00 |
| Output Price (/ 1M tokens) | $10.00 | $0.60 | $4.40 | $10.00 | $20.00 |
ChatOSS Agentic Coding Index
ChatOSS Benchmark Audit · 4-benchmark composite mean
DeepSWE v1.1
DeepSWE / Official Audit · Mini-SWE-Agent
Vibe Code Bench v1.1
Vals.ai · OpenHands
Terminal-Bench 4.0
Vals.ai / Artificial Analysis · Terminus 2
Code Migration
Vals.ai · Vals evaluation harness
Artificial Analysis Intelligence Index
Artificial Analysis
Design Arena: BLENDER3D
Design Arena · Rank #3 (64.1% win)
Design Arena: MOBILEAPPS
Design Arena · Rank #3 (60% win)
Design Arena: SPREADSHEET
Design Arena · Rank #4 (53.3% win)
Design Arena: WEBAPPS
Design Arena · Rank #3 (60.3% win)
Active Provider Endpoints (8)
Upstream inference providers serving Claude Sonnet 5.5, with per-provider pricing, context limits, quantization, and 24-hour uptime.
| Provider | Input / 1M | Output / 1M | Cache Read / 1M | Context | Max Output | Quantization | Uptime (24h) |
|---|---|---|---|---|---|---|---|
Google google-vertex/global | $2.00 | $10.00 | $0.10 | 1M | 128K | — | 100.0% |
Amazon Bedrock amazon-bedrock | $2.00 | $10.00 | $0.10 | 1M | 128K | — | 100.0% |
Azure azure/global | $2.00 | $10.00 | $0.10 | 1M | 128K | — | 100.0% |
Claude Platform on AWS claude-on-aws | $2.00 | $10.00 | $0.10 | 1M | 128K | — | 100.0% |
Anthropic anthropic | $2.00 | $10.00 | $0.10 | 1M | 128K | — | 100.0% |
Google google-vertex/us | $2.20 | $11.00 | $0.11 | 1M | 128K | — | 99.9% |
Azure azure/us | $2.20 | $11.00 | $0.11 | 1M | 128K | — | 100.0% |
Google google-vertex/europe | $2.20 | $11.00 | $0.11 | 1M | 128K | — | 100.0% |
Supported API Parameters
Parameters accepted by this model when called through ChatOSS or OpenRouter.
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