Model-Native Harness: Why OpenAI and Anthropic Are Killing ReAct Loops
May 2026's biggest agent-architecture shift: planning, tool selection, and self-correction move inside the model. Framework code shrinks. Here is what changes.
9 min read
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AI Voice Agent Insights & Guides
Browse older CallSphere articles on AI voice agents, contact center automation, and conversational AI.
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Latest articles
CallSphere vs GPT-Realtime-2: Real-World Buyer Guide (2026)
OpenAI just launched GPT-Realtime-2 — should you build your voice agent on the raw API or use a managed platform like CallSphere? An honest buyer guide.
9 min read
Anatomy of an AI Pitchbook Builder Powered by Claude Opus 4.7
A close look at the pitchbook builder template Anthropic shipped on May 5, 2026: model, tool stack, document flow, and where the human-in-the-loop sits.
8 min read
Automotive Voice Agents in May 2026: Sales + Service + BDC
With the voice AI market at $47.5B by 2034 and OpenAI's realtime release this week, every dealership and service shop should be evaluating voice agents. Here's how.
8 min read
GPT-Realtime-2 vs CallSphere: Build vs Buy for Voice Agents
A buyer-side comparison: building a phone agent on OpenAI's GPT-Realtime-2 API vs buying CallSphere. TCO, time-to-launch, and what you actually own.
8 min read
ReAct Loop vs Model-Native: Head-to-Head on Reliability and Cost
Head-to-head comparison of ReAct framework loops vs model-native agent architectures in 2026. Reliability, latency, cost, and what to ship.
8 min read
Gemini Enterprise vs Anthropic vs OpenAI Frontier: 2026 Comparison
A three-way comparison of Gemini Enterprise, Anthropic managed agents and OpenAI Frontier Platform after Cloud Next 2026 — strengths, gaps, buyer fit.
9 min read
A2A Protocol Explained: The Agent Card JSON, Discovery, And Tasks
A2A is the open standard for agent-to-agent coordination. Here is how the Agent Card JSON works, how discovery happens, and what to publish.
9 min read
Anthropic's Financial Services Platform: State of Play in May 2026
Anthropic's May 2026 push positions Claude as a vertical platform for financial services. The strategic positioning versus OpenAI and Google.
8 min read
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