anthropic
POST /v1/messagesClaude 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.
Total Context
200Ktokens
Max Output
64Ktokens
Released
Nov 24, 2025
Modalities
Claude Opus 4.5 Price
| Input Price | Output Price | Cache Read | Cache Create 5m |
|---|---|---|---|
| $5/M | $25/M | $0.5/M | $6.25/M |
Claude Opus 4.5 API
Claude Opus 4.5 Benchmark
40.8
/100
Artificial Analysis Intelligence Index
Artificial Analysis broad capability aggregate
Index score
47.8
/100
Artificial Analysis Coding Index
Artificial Analysis software task aggregate
Index score
91.3
/100
Artificial Analysis Math Index
Artificial Analysis math reasoning aggregate
Index score
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.
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