One difference that remains is that GPT-5 maintains low hallucination rate - super important for RAG and agentic flows.
We just added GPT-5-High to the @vectara.bsky.social hallucination leaderboard:

github.com/vectara/hall...

Excited about the Data Council 2025 event next week.

We finally have an animal selected for our upcoming O'Reilly book "Hands-on RAG for production" - the Brown Hyena. Two first chapters (as early release) expected in May.

Gemini-Flash-2.0 just took the #1 spot in Vectara's hallucination leaderboard, passing GPT-O3-mini

github.com/vectara/hall...

Congrats to the @deepseek.bsky.social team for the amazing capabilities of DeepSeek-R1, showing impressive reasoning capabilities, and a 25x cost savings relative to OpenAI o1.

However... it hallucination rate is 14.3% - much higher than O1!