GPT-6 Astra is the most capable coding model ever built. That only matters if it knows how your code is put together. Without Synapse, it's a talented junior — grep, guess, pray the build passes. With Synapse? Astra is a confident senior engineer. Synapse MCP is the structural brain: a local AST graph, 50+ languages, instant caller trees, edits simulated before they land. 60% fewer tokens. 2.2x faster. No babysitting. Astra reasons; Synapse knows how all of your code is built. Fast. Local. Free.