Astra · GPT · Claude · Gemini — one studio
Build faster with every AI model in one place
Compare, create and collaborate with Astra, GPT, Claude, Gemini and more.
No account needed — chats stay on your device
The studio
Everything a model playground should have, nothing it shouldn’t
Streaming first
Tokens render the instant they arrive — markdown, code and tables stay smooth at 60fps even mid-stream.
Side-by-side compare
One prompt, up to four models answering at once. Stop, copy and time each column independently.
Switch models mid-chat
Change the model at any turn and regenerate the same answer with a different mind.
Local-first history
Conversations live in your browser — searchable, pinnable, exportable as Markdown or JSON.
A theme engine, not a toggle
Eight accents, AMOLED black, glass surfaces, your corner radius — every choice applies instantly.
Keyboard native
⌘K palette, slash commands in the composer, shortcuts for every panel. Hands stay on the keys.
The roster
One key, every frontier model
The Astra gateway proxies the models you already use — and anything OpenAI-compatible plugs in beside them.
Astra
Experiential Labsgpt-6-astra
The house model — fast, multimodal, 200k context.
GPT-5
OpenAIgpt-5
Deep reasoning with a 400k window.
Claude Sonnet 5
Anthropicclaude-sonnet-5
Long-form thinking and careful code.
Gemini 2.5 Pro
Googlegemini-2.5-pro
A million tokens of context.
Grok 4
xAIgrok-4
Sharp, current, opinionated.
DeepSeek
DeepSeekdeepseek-reasoner
Open-weights reasoning value.
Compare mode
Stop guessing which model is right — ask them all
Ship the migration behind a feature flag. Roll out to 5% of traffic, watch error rates for a day, then ramp. Rollback is a flag flip, not a deploy…
I'd separate the schema change from the code change. Expand first (add the new column, dual-write), migrate the backfill, then contract once reads have moved…
Same prompt: “How would you roll out a risky database migration?”
Your next idea deserves more than one model’s opinion
Open the studio, pick a model — or four — and start generating. No sign-up, no install.