Anthropic
Claude Sonnet 5.5
claude-sonnet-5.5
Total Context
1M
Max Output
128K
Released
N/A
Input$2 / M tokens
Output$10 / M tokens
Claude Opus 4.5
claude-opus-4.5Claude Opus 4.5 belongs to the Opus 4 generation of high-capability Claude models, with model cards emphasizing difficult reasoning, coding, and agentic work. It sits below newer Opus releases but still represents the premium capability tier of its generation. The description should avoid presenting it as a generic chat model and instead stress deep work and reliability.
Context Window
200K tokens
Maximum Output
64K tokens
Release Date
Nov 24, 2025
Modalities
Claude Opus 4.5 Pricing
| Input Price | Output Price | Cache Read | Cache Create 5m |
|---|---|---|---|
| $5/M | $25/M | $0.5/M | $6.25/M |
Claude Opus 4.5 API Capabilities
Reasoning
Supported
Tool calling
Supported
Temperature parameter
Supported
Attachments
Supported
Knowledge Base
2025-03-31
Endpoint Protocols
Messages API
Claude Opus 4.5 Model Highlights
Claude Opus 4.5 combines efficient deep reasoning, autonomous agent execution and strong software engineering for complex professional tasks.
Efficient Deep Reasoning
Handles ambiguity and weighs tradeoffs while reaching solutions with less redundant exploration and backtracking.
Long-Horizon Agency
Sustains multi-step workflows with fewer dead ends, coordinating actions and preserving progress over extended tasks.
Software and Computer Work
Combines software engineering with visual computer interaction for coding, debugging and operational workflows.
Claude Opus 4.5 Use Cases
Claude Opus 4.5 is suited to code migrations, multi-stage research and complex spreadsheet or presentation workflows.
Code Migration and Refactoring
Analyze dependencies across systems, plan a coordinated migration and update implementations with tests.
Multi-Stage Deep Research
Retrieve information, compare sources and coordinate focused research steps to produce a well-supported synthesis.
Spreadsheet and Presentation Work
Interpret business data, construct financial or operational models and turn findings into presentation-ready material.
How to Use Claude Opus 4.5 via the TokenHub API
curl 'https://us-api.tokenhub.com/v1/messages' \
-X 'POST' \
-H "Authorization: Bearer $TOKENHUB_API_KEY"Claude Opus 4.5 Benchmarks
| Index score | ||
|---|---|---|
| Artificial Analysis Intelligence Index | Artificial Analysis broad capability aggregate | 40.8 |
| Artificial Analysis Coding Index | Artificial Analysis software task aggregate | 47.8 |
| Artificial Analysis Math Index | Artificial Analysis math reasoning aggregate | 91.3 |
| Knowledge & Reasoning | ||
| MMLU-Pro | Advanced multi-task knowledge | 89.5% |
| GPQA | Advanced science problem solving | 86.6% |
| HLE | Broad expert-level exam set | 28.4% |
| Coding & Engineering | ||
| LiveCodeBench | Live coding problems | 87.1% |
| SciCode | Scientific coding challenges | 49.5% |
| Terminal-Bench Hard | Hard terminal task execution | 47.0% |
| Math | ||
| AIME 2025 | Competition math problems | 91.3% |
| Instruction Following & Agent Tasks | ||
| IFBench | Prompt constraint adherence | 58.0% |
| AA-LCR | Long-context reasoning | 74% |
| τ²-Bench | Agent workflow tasks | 89.5% |
Metrics sourced from Artificial Analysis
Frequently asked questions about Claude Opus 4.5
Understand what Claude Opus 4.5 is, its best uses, distinguishing strengths, practical tradeoffs, and safe TokenHub integration guidance.
What is Claude Opus 4.5, and where does it fit in Anthropic’s model lineup?+
Claude Opus 4.5 is an earlier Opus flagship for difficult coding and professional analysis. It is an older generation, so compare it with newer family members before starting a new production deployment.
Which workloads are the best fit for Claude Opus 4.5?+
Best-fit scenarios include difficult software-engineering tasks, professional document and decision analysis, and long-running multi-step workflows. Test representative inputs and define measurable acceptance criteria before production.
Why might a team select Claude Opus 4.5 over a smaller or older model?+
Key strengths include strong coding performance, strict instruction following, and reliable execution of multi-step agent workflows. This combination is especially useful for professional document and decision analysis.
What should be validated before relying on Claude Opus 4.5?+
Consider another model when the project can benefit from a newer Opus generation, a newer model offers a clearer migration path and longer support horizon, or the workflow cannot include human review for important decisions. Run generated code through tests, security checks, and human review before merging or deployment.
What is the practical TokenHub setup guidance for Claude Opus 4.5?+
In TokenHub, select the exact model identifier displayed for Claude Opus 4.5, use the endpoint documented for your account, and authenticate with your TokenHub credentials. Pin the exact TokenHub identifier only after confirming that this older generation is still available and appropriate for the support horizon you need.
Ready to use Claude Opus 4.5?
Use one API key to access Claude Opus 4.5 and more AI models through TokenHub.
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