Claude Opus 4.8 Fast

claude-opus-4.8-fast

Claude 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.

Context Window

1M tokens

Maximum Output

128K tokens

Release Date

May 28, 2026

Modalities

Claude Opus 4.8 Fast Pricing

Input PriceOutput PriceCache Read
$10/M$50/M$1/M

Claude Opus 4.8 Fast API Capabilities

Reasoning

Supported

Tool calling

Supported

Temperature parameter

Not supported

Attachments

Supported

Knowledge Base

—

Endpoint Protocols

Completions APIMessages API

Claude Opus 4.8 Fast Model Highlights

Claude Opus 4.8 Fast applies the same Opus 4.8 reasoning, coding and multimodal strengths through Anthropic’s higher-speed execution mode.

Accelerated Execution

Runs Opus 4.8 in fast mode at about 2.5 times its standard speed while retaining the same model capabilities.

Agentic Reasoning

Retains Opus 4.8’s ability to plan, monitor progress and make considered decisions across multi-step tasks.

Coding and Multimodal Analysis

Preserves Opus 4.8’s end-to-end coding and ability to reason over documents, diagrams and other visual material.

Claude Opus 4.8 Fast Use Cases

Claude Opus 4.8 Fast is suited to interactive engineering, time-sensitive agent loops and rapid multimodal analysis where response speed matters.

Interactive Engineering

Iterate quickly on code, tests and fixes while preserving Opus 4.8’s ability to reason about complex implementations.

Time-Sensitive Agent Loops

Shorten feedback cycles for agents that repeatedly inspect state, choose actions and verify outcomes.

Rapid Multimodal Review

Review PDFs, diagrams and interface captures with faster turnaround, producing concise findings for immediate iteration.

How to Use Claude Opus 4.8 Fast via the TokenHub API

Create API key
import OpenAI from "openai"

const client = new OpenAI({
  apiKey: process.env.TOKENHUB_API_KEY,
  baseURL: "https://us-api.tokenhub.com/v1",
})

const result = await client.chat.completions.create({})
console.log(result.choices[0]?.message?.content)

Claude Opus 4.8 Fast Benchmarks

Claude Opus 4.8 (Adaptive Reasoning, Max Effort)

Index score
Artificial Analysis Intelligence IndexArtificial Analysis broad capability aggregate55.7
Artificial Analysis Coding IndexArtificial Analysis software task aggregate56.7
Knowledge & Reasoning
GPQAAdvanced science problem solving92%
HLEBroad expert-level exam set45.7%
Coding & Engineering
SciCodeScientific coding challenges53.5%
Terminal-Bench HardHard terminal task execution58.3%
Instruction Following & Agent Tasks
IFBenchPrompt constraint adherence62.2%
AA-LCRLong-context reasoning67.7%
τ²-BenchAgent workflow tasks94.4%

Metrics sourced from Artificial Analysis

Media and Discussions

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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.

Ready to use Claude Opus 4.8 Fast?

Use one API key to access Claude Opus 4.8 Fast and more AI models through TokenHub.

Create API key