claude-fable-5 — API, Pricing & Context Window | Vivgrid
Run Anthropic's claude-fable-5 on Vivgrid: the first Fable-tier Claude model, with a 1M-token context window, 128K max output, and geo-distributed acceleration.
claude-fable-5 opened Anthropic's Fable tier — the frontier above Opus — for demanding reasoning and long-running agentic workloads. It offers a 1M-token context window, 128K-token max output, and always-on adaptive thinking, at the same per-token price as its successor claude-fable-5-1.
On Vivgrid, claude-fable-5 is geo-distributed across AMER, EMEA, and APAC and reachable two ways with the same unified API key: the native Messages API (/messages) for Claude-compatible coding clients, and Chat Completions (/chat/completions) for agent projects and OpenAI-shaped SDKs.
Specifications
| Provider | Anthropic |
| Model ID | claude-fable-5 |
| Best for | Coding |
| Available on | Chat Completions, Vibe coding |
| Context window | 1,000,000 tokens |
| Max output | 128,000 tokens |
| Modalities | Text, Image |
| Tool / function calling | Yes |
| Knowledge cutoff | 2026-06 |
| Acceleration | ⚡ Geo-Distributed — AMER, EMEA, APAC |
Pricing
Pricing in USD per 1M tokens, matching the provider's rates.
| Input | Cached input | Output |
|---|---|---|
| $10.00 | $1.25 | $50.00 |
What one request costs
The rates above applied to a 20K-token prompt with a 2K-token reply — a typical single agent turn, small enough that every request is billed at the base rate.
| Request | Cost |
|---|---|
| Cold prompt, nothing cached | $0.3000 |
| Warm prompt, 90% of the input served from cache | $0.1425 |
Prompt caching is billed at $12.50 per 1M cache-write tokens on the 5-minute TTL and $20.00 per 1M on the 1-hour TTL, with cached reads at $1.25.
API surfaces
The Vivgrid Console catalogs claude-fable-5 on 2 surfaces, all behind the same API key. The endpoint shown is the one the Console previews for that surface.
| Surface | Primary endpoint | Use it for |
|---|---|---|
| Chat Completions | /chat/completions | Agent projects, where Vivgrid injects the model, system prompt and tools server-side, and Model API calls that name the model per request. |
| Vibe coding | /messages | Coding CLIs and IDE agents that drive the model themselves — point the tool at Vivgrid and keep your own loop. |
Quick start
Get an API key from the Vivgrid Console, then call claude-fable-5 directly.
/chat/completions
curl https://api.vivgrid.com/v1/chat/completions \
-H "Authorization: Bearer $VIVGRID_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "claude-fable-5",
"messages": [
{ "role": "user", "content": "Say hello in English, Chinese and Spanish." }
],
"stream": true
}'/messages
curl https://api.vivgrid.com/v1/messages \
-H "Authorization: Bearer $VIVGRID_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "claude-fable-5",
"max_tokens": 1024,
"messages": [
{ "role": "user", "content": "Say hello in English, Chinese and Spanish." }
],
"stream": true
}'Choosing within the Claude 5 family
Prices are USD per 1M tokens at the base rate. Rows marked this page are the model described here.
| Model | Context | Max output | Input | Output |
|---|---|---|---|---|
claude-fable-5-1 | 1,000,000 | 128,000 | $10.00 | $50.00 |
claude-fable-5 — this page | 1,000,000 | 128,000 | $10.00 | $50.00 |
claude-opus-5-5 | 1,000,000 | 128,000 | $4.00 | $20.00 |
claude-opus-5 | 1,000,000 | 128,000 | $5.00 | $25.00 |
claude-sonnet-5-5 | 1,000,000 | 128,000 | $2.00 | $10.00 |
claude-sonnet-5 | 1,000,000 | 128,000 | $2.00 | $10.00 |
claude-haiku-5-5 | 1,000,000 | 128,000 | $0.10 | $0.50 |
Ideal use cases
- Frontier coding agents and autonomous software development
- Long-context analysis and refactoring within a 1M-token budget
- Complex planning and reasoning across long agent sessions
- Workloads already tuned for Fable-tier behavior
Related models
- claude-fable-5-1 — the newer Fable release with cheaper cache reads
- claude-opus-5-5 — the latest Opus model at a lower price
- claude-sonnet-5-5 — a faster, lower-cost Claude model
claude-fable-5-1
Run Anthropic's claude-fable-5-1 on Vivgrid: the most capable Claude model, with a 1M-token context window, 128K max output, and worldwide geo-distributed acceleration.
claude-opus-5-5
Run Anthropic's claude-opus-5-5 on Vivgrid: the latest Opus model for long-running agentic coding, with a 1M-token context window, 128K max output, and geo-distributed acceleration.