Pricing, context window, capabilities, and release date — pulled from each provider's public docs. Both are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.
Both models stream in parallel through your own AIgateway key. Tokens, latency, and cost update as they arrive.
| Claude Opus 5 anthropic/claude-opus-5 | Claude Fable 5 anthropic/claude-fable-5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Family | Claude 4 | |
| Modality | text | text |
| Context window | 1,000,000 tok | 1,000,000 tok |
| Max output | 128,000 tok | 128,000 tok |
| Released | 2026-07-24 | 2026-06-09 |
| Input price | $5.00 /1M | $10.00 /1M |
| Output price | $25.00 /1M | $50.00 /1M |
| Cache read | — | — |
| Tools | yes | yes |
| Streaming | yes | yes |
| Vision | yes | yes |
| JSON mode | yes | yes |
| Reasoning | yes | — |
| Prompt caching | — | — |
Claude Opus 5 is Anthropic's model for complex agentic coding and enterprise work, delivering intelligence close to Claude Fable 5 at half the price. It uses adaptive thinking to calibrate reasoning per task and supports a one million token context window at standard pricing.
Claude Fable 5 is Anthropic's most capable widely released model, built for the most demanding reasoning and long-horizon agentic work. Adaptive thinking is always on, and the model supports a 1M token context window with up to 128k output tokens per request.
# pip install aigateway-py openai
# aigateway-py: sub-accounts, evals, replays, jobs, webhook verify.
# openai SDK: chat/embeddings/images/audio — drop-in compat per our SDK's own guidance.
from openai import OpenAI
client = OpenAI(
base_url="https://api.aigateway.sh/v1",
api_key="sk-aig-...",
)
# Try Claude Opus 5
client.chat.completions.create(
model="anthropic/claude-opus-5",
messages=[{"role":"user","content":"hello"}],
)
# Try Claude Fable 5 — same client, same key
client.chat.completions.create(
model="anthropic/claude-fable-5",
messages=[{"role":"user","content":"hello"}],
)