anthropic/claude-opus-4.8 Free API on OpenRouter

Free API Verified

Available from OpenRouter

Catalog metadata matched Reasoning models.dev metadata

Top Claude Opus tier for the hardest reasoning, coding, and long-horizon agents

Free APIOpenRouter nativeReasoningTool callingPDF input

Try in Playground Compare Save

Context window 8K

Max output 4K

API format OpenRouter native

Status Online

AI Recommendation

Should you use anthropic/claude-opus-4.8?

anthropic/claude-opus-4.8 is listed for chat workloads and supports a 8K context window.

Use it when OpenRouter's free tier is enough for evaluation, demos, or light production traffic.

Best for

Chat

Strengths & Weaknesses

Strengths

Reasoning mode listed
Tool calling support
Live API verification available

Watch outs

Free-tier rate limits apply
Vision support is not listed

Model Metadata

anthropic/claude-opus-4.8 model ID and technical details

Provider and model catalog

Model ID anthropic/claude-opus-4.8

Family claude-opus

Released May 28, 2026

Last updated May 28, 2026

Free listing since Jul 7, 2026

Input text, image, pdf

Output text

Capabilities reasoning, tool calling, file attachments

External benchmark references

Benchmark	Score	Metric	Date
SWE-Bench Pro	69.2	resolve rate	2026-05-28
Terminal-Bench	74.6	success rate	2026-05-28

Pricing

anthropic/claude-opus-4.8 pricing per 1M tokens

Free tier listed

Input $5 per 1M tokens

Output $25 per 1M tokens

Free access Available OpenRouter

Rate limit 200 req/day (free tier) provider policy

Availability

anthropic/claude-opus-4.8 availability by provider

Current provider only

We only found this anthropic/claude-opus-4.8 listing on OpenRouter in the current catalog. Use the related models section for nearby alternatives.

Provider	Model listing	Access	Context	API	Limits
OpenRouter	anthropic/claude-opus-4.8	Free tier	8K	Native	200 req/day (free tier)

View OpenRouter setup guide →

Compare

anthropic/claude-opus-4.8 alternatives to consider

Open comparison

Model	Provider	Context	Access
Poolside: Laguna XS 2.1 (free)	OpenRouter	262K	Free tier
Cohere: North Mini Code (free)	OpenRouter	256K	Free tier
NVIDIA: Nemotron 3.5 Content Safety (free)	OpenRouter	128K	Free tier
NVIDIA: Nemotron 3 Ultra (free)	OpenRouter	1.0M	Free tier
NVIDIA: Nemotron 3 Nano Omni (free)	OpenRouter	256K	Free tier

Typical Use Cases

anthropic/claude-opus-4.8 use cases

Chat

anthropic/claude-opus-4.8 is tagged for chat in this catalog.

FAQ

anthropic/claude-opus-4.8 free API FAQ

Is anthropic/claude-opus-4.8 free to use?

anthropic/claude-opus-4.8 is listed with free API access on OpenRouter, subject to the provider's quota and account policy.

What is the anthropic/claude-opus-4.8 model ID?

The model ID shown in this catalog is anthropic/claude-opus-4.8.

What are the anthropic/claude-opus-4.8 free tier rate limits on OpenRouter?

The listed free tier limit is 200 req/day (free tier). Limits can change per account tier, so confirm against the provider dashboard.

What context window does anthropic/claude-opus-4.8 support?

The listed context window is 8K tokens with up to 4K output tokens.

More about anthropic/claude-opus-4.8