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November 19, 2025Wednesday
  1. Vapi Blog35

    GPT-5.1 Brings Personality Presets to Voice AI, Now Live on Vapi

    OpenAI's GPT-5.1 adds consistent personality presets — Default, Professional, Friendly, Candid, Quirky, Efficient, Nerdy, and Cynical — plus a more conversational GPT-5.1 Instant and fast adaptive reasoning that gives simple questions quick replies while complex ones get more thinking. Vapi says the model went live on its platform last week alongside OpenAI's announcement, letting voice agents adopt brand-consistent tones without prompt rewrites.

June 18, 2025Wednesday
  1. Vapi Blog22

    Claude vs ChatGPT: The Complete Comparison Guide

    Claude and ChatGPT are compared across conversational quality, context memory, speed, features, creative writing, research, pricing, and interface. Claude handles up to 200,000+ tokens for Pro users and excels at creative writing and nuanced conversation, while ChatGPT supports 128,000 tokens, responds in 2-3 seconds versus Claude's 5-10 seconds, and offers image generation and Custom GPTs. Both Pro tiers cost $20 per month, with Claude Max at $100-$200 and ChatGPT Pro at $200.

June 5, 2025Thursday
  1. Vapi Blog22

    GPT-4.1 vs Claude 3.7 Sonnet: Which AI Delivers Better Voice Agents?

    Vapi compares GPT-4.1 and Claude 3.7 Sonnet as the LLM behind voice agents, weighing conversation quality, context handling, reasoning transparency, platform integration and cost. GPT-4.1 offers a 1,000,000-token context window and 32,768-token outputs with 75% caching discounts, while Claude 3.7 provides a 200,000-token context and 128,000-token outputs. Both models are selectable on Vapi's voice agent platform.

June 4, 2025Wednesday
March 26, 2024Tuesday
  1. Modal Blog22

    How Ramp automated receipt processing with fine-tuned LLMs on Modal

    Ramp used Modal to fine-tune its LLMs and build a text-to-structured-JSON model for receipt management, cutting receipts requiring manual intervention by 34% on infrastructure estimated 79% cheaper than major LLM providers like OpenAI. Modal functions trained many candidate models in parallel, persisted weights to Modal volumes, and served a parametrized inference endpoint. One engineer also ported a PII-stripping script for 25,000 invoices to Modal, parallelizing it on 256 cloud workers to finish in 20 minutes for $100 instead of 3 days locally.