Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 2 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.
GPT-6 Astra is OpenAI's most capable model, built for complex reasoning, coding, computer use, research, and document creation.
Claude Fable 5.1 is Anthropic's next model in the Fable family, with improvements in agentic coding, long-running agentic workflows, knowledge work, front-end and visual code generation, and finance and analysis tasks. It supports adaptive thinking and a 1M token context window.
from openai import OpenAI
client = OpenAI(
base_url="https://api.aigateway.sh/v1",
api_key="sk-aig-...",
)
# GPT-6 Astra
client.chat.completions.create(
model="openai/gpt-6-astra",
messages=[{"role":"user","content":"hello"}],
)
# Claude Fable 5.1
client.chat.completions.create(
model="anthropic/claude-fable-5.1",
messages=[{"role":"user","content":"hello"}],
)