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ModelCap

Claude Opus 4.8 (Fast)

API only

Anthropic·anthropic/claude-opus-4.8-fast

Claude Opus 4.8 (Fast) is a language model published by Anthropic. 1 OpenRouter endpoint is published in the latest snapshot. It accepts text, image, file input and returns text. The published context limit is 1M tokens. The catalogue declares support for reasoning, tool use, structured outputs.

Rank and capability evidence
See Claude Opus 4.8
Route-specific operations remain below
Market Gravity
30.9
Secondary market signal

Superseded by Claude Opus 5 (Fast). It no longer holds a current-board position.

This separately configured or accelerated route is reviewed as the same underlying model identity as Claude Opus 4.8. That canonical product owns rank and capability evidence; pricing, providers and other operational differences remain route-specific below.

Input
$10.00
per 1M tokens
Output
$50.00
per 1M tokens
Context
1M
tokens
Providers
1
endpoint
Gateway spend
—
latest · Vercel share

Providers

Uptime measured over the last 30 minutes
ProviderInputOutputContextQuantUptime
Anthropic$10.00$50.001M—100.0%

Other versions (2)

Deployment readiness

Metadata index
30.1
limited · 38% metadata coverage
Not capability
Artifact reproducibility
0.0
Access & legal clarity
30.3
Deployability
80.0
Evaluation provenance
0.0

Missing: artifactReproducibility.revision-sha, artifactReproducibility.architecture-and-model-type, artifactReproducibility.parameter-count, artifactReproducibility.serialized-weight-format, artifactReproducibility.base-lineage, accessLegalClarity.declared-license, accessLegalClarity.resolvable-license-terms, evaluationProvenance.admitted-evaluation-observations, evaluationProvenance.capability-family-breadth, evaluationProvenance.evaluation-source-diversity, evaluationProvenance.identity-and-source-confidence, evaluationProvenance.evaluation-dataset-revisions.

A metadata completeness and deployability index—not a safety certification, quality grade, or production-readiness claim.

Market activity

Venue coverage
Market Gravity
30.9
OpenRouter weekly popularity
#127 of 298

Market Gravity uses OpenRouter’s full-catalogue popularity order. Sparse Vercel top-ten observations appear only when published and do not affect the score.

Market Gravity breakdown

Usage55%
15.0

OpenRouter weekly popularity across the full model catalogue.

Liquidity25%
45.6

Independent providers versus the model's open or closed cohort, weighted by uptime.

Open reach15%
50.0

Hugging Face 30-day downloads for open models; neutral for closed models.

Freshness5%
76.0

Time since first public availability, on a six-month half-life.

Specification

Context window
1M tokens
Max output
128K tokens
Inputs
Text, Image, File
Outputs
Text
Tokenizer
Claude
Cached input tokens
$1.00 / 1M
First seen on OpenRouter
27 May 2026

Capabilities

  • Supported: Reasoning
  • Supported: Tool use
  • Supported: Structured output
  • Supported: Response format
  • Supported: Moderated