Simon Willison · researchers ☆ FOLLOW 45 topic(s) over 17 day(s) — agents, multimodal, system_design. on X ↗
CARD NO. 2026-10-05 ChatGPT expands plugin ecosystem and rolls out capacity upgrades for GPT-6.1 Sol system_design · 15 voicesAnthropic launches dedicated developer portal and resource hub for Claude system_design · 4 voices
CARD NO. 2026-10-04 Anthropic launches Sonnet 5.5 model family and extends thinking persistence architecture · 17 voicesChatGPT expands its plugin system and integrates new automation features system_design · 16 voicesAnthropic launches dedicated developer portal and documentation hub system_design · 4 voices
CARD NO. 2026-10-03 Claude Sonnet 5.5 releases with 30% faster speed and isolated context thinking inference · 23 voicesAnthropic launches new developer portal for engineering guides and resources system_design · 4 voices
CARD NO. 2026-10-02 Anthropic launches new developer portal for building with Claude system_design · 4 voices
CARD NO. 2026-10-01 Anthropic Launches New Developer Portal for Claude Builders system_design · 4 voices
CARD NO. 2026-09-30 ChatGPT opens up platform to build native apps and plugin extensions system_design · 13 voicesGoogle launches Gemini 3.8 Flash TTS and Flash-Lite TTS audio model duo multimodal · 13 voicesAnthropic optimizes claude.ai performance and brings Sonnet 5.5 to the free tier system_design · 5 voices
CARD NO. 2026-09-29 Claude Opus 5.5 introduced with 40% lower operating costs architecture · 22 voicesGPT-6 Sol and GPT-6 Luna launched with API prices 50% lower inference · 17 voicesAnthropic launches Claude Sonnet 5.5 with higher speed and lower cost architecture · 14 voicesGoogle launches Gemini 3.8 Flash TTS text-to-speech models multimodal · 13 voicesChatGPT integrates workspace tools and expands high-tier subscription plans agents · 13 voices
CARD NO. 2026-09-28 ChatGPT Voice integrates plugins and introduces new pricing tiers multimodal · 15 voicesOpenAI releases GPT-6 Sol and GPT-6 Luna models architecture · 12 voicesOpenAI and xAI announce model lineups and benchmark improvements evaluation · 11 voicesGoogle launches new Gemini Flash audio model variants multimodal · 8 voices
CARD NO. 2026-09-27 OpenAI introduces GPT-6 Sol and GPT-6 Luna models architecture · 19 voicesChatGPT Voice integrates plugins and expands pricing tiers multimodal · 15 voicesGoogle introduces Gemini 3.8 Flash TTS and Flash-Lite TTS multimodal · 13 voices
CARD NO. 2026-09-26 Google introduces Gemini 3.8 Flash TTS and Flash-Lite TTS audio generation models multimodal · 16 voicesOpenAI expands its ecosystem with GPT-6 Sol and Luna models architecture · 16 voicesChatGPT Voice gains support for plugins and expands tiers agents · 11 voices
CARD NO. 2026-09-24 OpenAI releases GPT-6 Sol and GPT-6 Luna alongside Tesseract video tools multimodal · 15 voicesClaude Code adds AGENTS.md configuration support and cloud session capabilities agents · 11 voicesGoogle launches Gemini 3.8 Flash and Flash-Lite TTS audio model family multimodal · 10 voicesChatGPT expands voice capabilities, multi-account plugins, and Chrome extensions agents · 8 voices
CARD NO. 2026-09-23 GPT-6 Sol and GPT-6 Luna models launched architecture · 12 voicesCodex integrates Images 2.5 capability agents · 11 voicesClaude Code adds AGENTS.md support and enhanced session management agents · 8 voices
CARD NO. 2026-09-22 Claude Code adds AGENTS.md support and parallel thread execution agents · 8 voicesCodex renews its open-source support program with 10,000 grants and integrates the Images 2.5 model multimodal · 8 voices
CARD NO. 2026-09-21 Claude merges Cowork and chat features while Codex expands open-source grants agents · 15 voicesClaude Code adds AGENTS.md support and NVIDIA introduces SoL-Pi agents · 10 voices
CARD NO. 2026-09-20 Claude Code adds AGENTS.md support and parallel project execution agents · 15 voicesCodex integrates Image 2.5 model and renews its open-source grant program agents · 15 voicesAnthropic integrates Salesforce and merges Claude Cowork into the main chat platform agents · 13 voices
CARD NO. 2026-09-19 ChatGPT launches multi-account support and desktop app extension features ai · 13 voicesClaude Code adds AGENTS.md support, parallel project execution, and Claude Mods ai · 11 voicesCodex renewed its OSS support program with Pro plans and doubled grants backend · 10 voices