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Free Claude Opus 5 API

Updated 7/25/2026

Anthropic's Opus 5: near-Fable coding/agent performance at half Fable list price ($5/$25), 1M context.

About the Model

Why Claude Opus 5?

Anthropic's 2026-07-24 Opus upgrade: near Claude Fable 5 intelligence at half Fable's list price (same $5 / $25 per MTok as Opus 4.8). A strong default for long-horizon coding and knowledge work.

Strengths

  • Same sticker, higher unit output on official task-cost curves (Frontier-Bench, CursorBench, OSWorld, etc.).
  • Stronger self-check / iteration for multi-file and end-to-end agent tasks.
  • 1M context + 128k max output.
  • Optional Fast mode (~2.5× speed, 2× price).

Free basis (this directory)

Via Vercel AI Gateway: unpaid teams typically get ~$5 credits / 30 days usable on anthropic/claude-opus-5 when free-tier eligible. Enough for smoke tests, not unlimited agents. Strict rate limits — not for production.

Scope

Multilingual text + image input, tool use, agentic coding. Default on Claude Max; strongest model on Claude Pro.

Deep dive: MuiRouter.

Try it in your browser

Pick a model, paste your own free key, and run. Your key is sent once to call the provider and never stored on our servers.

Pick a model, paste your own free key, and run. Your key is sent once to call the provider and never stored on our servers.

How to call Claude Opus 5

curl
curl https://ai-gateway.vercel.sh/v1/chat/completions \
  -H "Authorization: Bearer $AI_GATEWAY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "anthropic/claude-opus-5",
    "messages": [{"role":"user","content":"Summarize this PR in 5 bullets."}]
  }'
python
from openai import OpenAI

client = OpenAI(
    api_key="...",  # Vercel AI Gateway key
    base_url="https://ai-gateway.vercel.sh/v1",
)
resp = client.chat.completions.create(
    model="anthropic/claude-opus-5",
    messages=[{"role": "user", "content": "Summarize this PR in 5 bullets."}],
)
print(resp.choices[0].message.content)
javascript
import { streamText } from 'ai'

const result = streamText({
  model: 'anthropic/claude-opus-5',
  prompt: 'Implement the multi-file refactor described in this issue.',
  reasoning: 'medium',
})
for await (const part of result.textStream) process.stdout.write(part)

Provider Details

The following platforms provide free access to Claude Opus 5 through free tiers, trial credits, or daily quotas.

ProviderContext WindowFree QuotaRequires CCTrustAction
Vercel AI Gateway1000KMonthly Credits
$5/mo
No
Trust 98
Details

Frequently Asked Questions

Is Claude Opus 5 free to use?

Yes. Claude Opus 5 is available for free through 1 provider(s) listed below, with no purchase required.

What are the rate limits and quotas?

Free access varies by provider — Vercel AI Gateway: Monthly Credits.

How do I get a free Claude Opus 5 API key?

Sign up with Vercel AI Gateway, then create an API key from your dashboard. See the provider details above for the exact steps.

Which providers offer Claude Opus 5 for free?

Claude Opus 5 is currently available for free via: Vercel AI Gateway.

Know another free provider for Claude Opus 5?

Help the community by sharing other ways to access this model for free.