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Top stories today:
- OpenAI releases first open-weight models since GPT-2 in major shift
- OpenAI said to be in talks for share sale at $500B valuation
- Anthropic launches Claude Opus 4.1 with broad improvements
- Google DeepMind unveils Genie 3 āworldā model to generate 3D worlds
- Pfizer Q2 revenue +10% YoY to $14.7B, lifts 2025 outlook on cost cuts
0. Data and calendar
All values as of 6 AM ET / 3 AM PT, other than S&P500 and NASDAQ close (4 PM ET / 1 PM PT).
All times are ET.
Listen to our AI-generated podcast summarizing todayās newsletter (beware of hallucinations):
1. OpenAI releases first open-weight models since GPT-2 in major shift
gpt-oss-120b and gpt-oss-20b are OpenAIās two open-weight models, scoring 58 and 48, respectively, on the Artificial Analysis Intelligence Index:
Both models are Apache 2.0 licensed and available through Hugging Face.
gpt-oss-20b can even run locally on a consumer laptop with >16GB RAM, and gpt-oss-120b on higher-end machines.
The models use āchain-of-thought reasoningā approach, which was earlier deployed in the o-series.
2019: GPT-2 was launched as OpenAIās last open-weight model.
OpenAIās gpt-oss-120b is leading U.S. open-weight models, while Alibabaās Qwen3 235B is topping globally
The 120B model is significantly smaller than competing open-weight models, with 116.8B total parameters and 5.1B active parameters.
gpt-oss-120B is also the most intelligence model that can fit on a single H100 GPU in its native precision
At API providers, the median price of the 120B is $0.15/M input and $0.69/M output tokens, ~10Ć cheaper than o4-mini ($1.1/$4.4)
$0.08/$0.35 is the 20B modelās median price.
2. OpenAI said to be in talks for share sale at $500B valuation
Existing investors like Thrive Capital have reportedly sought to buy OpenAI employee shares.
A secondary sale could help OpenAI retain staff amid talent poaching by Meta and others.
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4. Anthropic launches Claude Opus 4.1 AI model with broad improvements at same cost
Opus 4.1 has debuted as an upgrade to Opus 4, with better coding performance:
