Anthropic
Claude Opus 5.5
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...
Cost / 1M tokens
High usage$4.00
input
$0.20
cached input
$20.00
output
Context Window
1M
Up to 128K max output
Modalities
text, image, file → text
Claude tokenizer
Quickstart & API
anthropic/claude-opus-5.5Best for & Strengths
Key Strengths
Recommended Workloads in ChatOSS
- Mission-critical architecture
- Multi-repo code migrations
- Hardest debugging sessions
Verified Evaluations
Benchmarks & Frontier Comparison
How Claude Opus 5.5 compares against leading open-weight and proprietary frontier models across independent agentic coding and reasoning suites.
| Benchmark (Metric) | Claude Opus 5.5 | DeepSeek V4.1 Flash | GLM 5.3 | Kimi K3.1 Pro | Gemini 4 Argon |
|---|---|---|---|---|---|
| Agentic & Software Engineering | |||||
| ChatOSS Agentic Coding Index (%) | 74.1% | 63.2% | 58.3% | 65% | 73.9% |
| SWE-Bench Verified (%) | 97% | 91.5% | 95.4% | 94.8% | 94% |
| DeepSWE v1.1 (Pass@1 %) | 74.2% | 77% | 69% | 73.5% | 77.9% |
| Vibe Code Bench v1.1 (%) | 90.29% | 87.7% | 78.1% | 88.4% | 91.9% |
| Terminal-Bench 4.0 (%) | 65.15% | 42.3% | 42% | 46.2% | 57.6% |
| Code Migration (%) | 66.65% | 45.6% | 44.2% | 52% | 68.2% |
| Intelligence & Token Economics | |||||
| Artificial Analysis Intelligence Index (0–100) | 57.6 | 39.5 | 44.8 | 55.1 | 52.6 |
| Input Price (/ 1M tokens) | $4.00 | $0.15 | $1.40 | $2.00 | $4.00 |
| Output Price (/ 1M tokens) | $20.00 | $0.60 | $4.40 | $10.00 | $20.00 |
ChatOSS Agentic Coding Index
ChatOSS Benchmark Audit · 4-benchmark composite mean
SWE-Bench Verified
Vals AI · Terminus 2
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
Terminal-Bench 2.1
Vals.ai · Terminus 2
Code Migration
Vals.ai · Vals evaluation harness
Artificial Analysis Intelligence Index
Artificial Analysis
GPQA Diamond (Pass@1)
Benchmark Audit
Humanity's Last Exam (Pass@1)
Artificial Analysis / Audit
Design Arena: BLENDER3D
Design Arena · Rank #4 (58.7% win)
Design Arena: MOBILEAPPS
Design Arena · Rank #2 (62% win)
Design Arena: SPREADSHEET
Design Arena · Rank #2 (69.3% win)
Design Arena: WEBAPPS
Design Arena · Rank #1 (61.1% win)
Active Provider Endpoints (11)
Upstream inference providers serving Claude Opus 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) |
|---|---|---|---|---|---|---|---|
Amazon Bedrock amazon-bedrock | $4.00 | $20.00 | $0.20 | 1M | 128K | — | 100.0% |
Azure azure/global | $4.00 | $20.00 | $0.20 | 1M | 128K | — | 99.5% |
Google google-vertex/global | $4.00 | $20.00 | $0.20 | 1M | 128K | — | 100.0% |
Claude Platform on AWS claude-on-aws | $4.00 | $20.00 | $0.20 | 1M | 128K | — | 100.0% |
Anthropic anthropic | $4.00 | $20.00 | $0.20 | 1M | 128K | — | 100.0% |
Amazon Bedrock amazon-bedrock/eu-west-1 | $4.40 | $22.00 | $0.22 | 1M | 128K | — | 100.0% |
Amazon Bedrock amazon-bedrock/us-east-1 | $4.40 | $22.00 | $0.22 | 1M | 128K | — | 100.0% |
Azure azure/us | $4.40 | $22.00 | $0.22 | 1M | 128K | — | — |
Google google-vertex/us | $4.40 | $22.00 | $0.22 | 1M | 128K | — | 100.0% |
Google google-vertex/europe | $4.40 | $22.00 | $0.22 | 1M | 128K | — | 100.0% |
Anthropic anthropic/fast | $8.00 | $40.00 | $0.40 | 1M | 128K | — | 100.0% |
Supported API Parameters
Parameters accepted by this model when called through ChatOSS or OpenRouter.
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