POST /v1/chat/completionsClaude Opus 4.8 Fast
claude-opus-4.8-fastClaude Opus 4.8 Fast is described as a fast-mode variant of Opus 4.8, retaining the same broad capability profile while prioritizing response speed. It is relevant when users want Opus-class reasoning, coding, and knowledge-work behavior but need lower latency. The key distinction is speed, not a different model family or a lighter capability tier.
Total Context
1Mtokens
Max Output
128Ktokens
Released
May 28, 2026
Modalities
Claude Opus 4.8 Fast Price
| Input Price | Output Price | Cache Read |
|---|---|---|
| $10/M | $50/M | $1/M |
Claude Opus 4.8 Fast API
Claude Opus 4.8 Fast Benchmark
Claude Opus 4.8 (Adaptive Reasoning, Max Effort)
55.7
/100
Artificial Analysis Intelligence Index
Artificial Analysis broad capability aggregate
Index score
56.7
/100
Artificial Analysis Coding Index
Artificial Analysis software task aggregate
Index score
Knowledge & Reasoning
GPQA
Advanced science problem solving
92%
HLE
Broad expert-level exam set
45.7%
Coding & Engineering
SciCode
Scientific coding challenges
53.5%
Terminal-Bench Hard
Hard terminal task execution
58.3%
Instruction Following & Agent Tasks
IFBench
Prompt constraint adherence
62.2%
AA-LCR
Long-context reasoning
67.7%
τ²-Bench
Agent workflow tasks
94.4%
Metrics sourced from Artificial Analysis
Frequently asked questions about Claude Opus 4.8 Fast
Understand what Claude Opus 4.8 Fast is, its best uses, distinguishing strengths, practical tradeoffs, and safe TokenHub integration guidance.
What kind of model is Claude Opus 4.8 Fast?+
Claude Opus 4.8 Fast is Claude Opus 4.8 running with Anthropic’s Fast mode, which trades premium pricing for higher output speed. Fast mode is a research preview and may have separate access, pricing, and limits from standard Opus.
What should teams use Claude Opus 4.8 Fast for?+
Best-fit scenarios include agents that need faster output, agentic coding and repository work, and professional document and decision analysis. Test representative inputs and define measurable acceptance criteria before production.
Where does Claude Opus 4.8 Fast have a clear technical advantage?+
Key strengths include higher output speed than standard mode, the underlying Opus model’s capability, and effective use of tools and function calls. This combination is especially useful for agentic coding and repository work.
When should a team choose another model instead of Claude Opus 4.8 Fast?+
Consider another model when the premium Fast-mode cost is not justified by the latency target, a stable interface and predictable behavior are mandatory, or the workload is simple enough for a smaller model. Verify important factual, legal, financial, medical, or operational outputs with qualified human review.
What should be checked before integrating Claude Opus 4.8 Fast with TokenHub?+
In TokenHub, select the exact model identifier displayed for Claude Opus 4.8 Fast, use the endpoint documented for your account, and authenticate with your TokenHub credentials. Confirm that Fast mode is enabled for your account and compare its current premium cost and limits with standard Opus before routing traffic.
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