Claude Fable 5.1 and GPT-6 Astra on Experiential

openai/gpt-6-astra is OpenAI GPT-6 Astra: a reasoning/chat model with ~1.05M context, tools, and vision input (text out). Routed only through Experiential Cloud (gpt-6-astra). Platform list $10 / $50 per 1M tokens; promotional platform price is $0 / $0 while the free daily tier lasts. Hosted experiential is still disabled (#2842) until the platform key is recertified — use Experiential BYOK today.

anthropic/claude-fable-5.1 keeps its Anthropic BYOK, Cloudflare, AIHubMix, and OpenRouter hops, and now also wires Experiential Cloud promotional slug claude-fable-5.1 at $0 / $0 (struck list $10 / $50). Same #2842 note: hosted platform hop is YAML-only until recert; BYOK twin is live.

• App code — Vercel AI SDK or OpenAI SDK.
• Coding agent — anyr claude / anyr opencode / anyr codex (playbook).
• No code — playground.

Try it in the Vercel AI SDK. createAnyRouter() reads ANYROUTER_API_KEY:

import { createAnyRouter } from "@anyr/ai-sdk-provider"
import { generateText } from "ai"

const anyrouter = createAnyRouter()

const { text } = await generateText({
  model: anyrouter("openai/gpt-6-astra"),
  prompt: "Summarize this diff in three bullets.",
})
console.log(text)

Already on the OpenAI SDK? OpenAI SDK playbook:

import OpenAI from "openai"

const client = new OpenAI({
  baseURL: "https://anyrouter.dev/api/v1",
  apiKey: process.env.ANYROUTER_API_KEY,
})

const res = await client.chat.completions.create({
  model: "openai/gpt-6-astra",
  messages: [{ role: "user", content: "Hello" }],
})
console.log(res.choices[0]?.message.content)

curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"openai/gpt-6-astra","messages":[{"role":"user","content":"Hello"}]}'

Or launch a coding agent through the anyr CLI:

curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr login
anyr claude --model "openai/gpt-6-astra"

curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr login
anyr opencode --model "openai/gpt-6-astra"

curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr login
anyr codex --model "openai/gpt-6-astra"

More: AI SDK · OpenAI SDK · coding agents.