WhichAI.todayDiffbot-Small-XL
Diffbot
Pick this when the research stack has to use downloadable weights.
Skip it when you need the top of the search board.
LMArena Search 1062. Apache 2.0 weights.
Diffbot-Small-XL vs GPT-5.6 Sol
Updated Nov 13, 2026. Checked daily.
The short answer
GPT-5.6 Sol ranks ahead in every job we track where either appears (research & web search).
Diffbot-Small-XL
0 of 1 job ahead
Free (limited)
GPT-5.6 Sol
1 of 1 job ahead
Paid plan
Head to head, job by job
Each job ranks a #1, an alternative, and an open-weights pick from public leaderboards. Bars compare the two scores on that job's own signal.
Diffbot-Small-XLGPT-5.6 Sol
Which one should you pick?
GPT-5.6 Sol
OpenAI
Pick this when you already work in ChatGPT and want top search performance.
Skip it when you need a citation you can open and the answer does not show one.
LMArena Search 1258.
Price, access, and privacy
Diffbot-Small-XLGPT-5.6 Sol
Cost
The weights are under Apache 2.0. A hosted search API may be paid.
Uses a ChatGPT plan. Check the plan page for the current price.
Free tier
The weights are free to download.
A free plan may include limited search.
Where to get it
Apps
- Hugging Face, Free (Free)
- ChatGPT, Plus ($20/month)
- Cursor, Premium ($30/month)
- GitHub Copilot, Copilot Pro+ ($39/month)
- Codex, Plus ($20/month)
Trains on chats
Not checked yet.
Yes on personal Free, Plus, and Pro. Improve the model for everyone is on by default. Settings, Data controls, turn off Improve the model for everyone.
Released
Before our release log began.
Before our release log began.
Try both with the same prompt
Diffbot-Small-XL
Find sources for this question and list what each one says.
GPT-5.6 Sol
Research this question. Name each source you used, and say what it does not answer.
Want a sharper prompt? Build one for either model.
Ranking history
- Nov 12, 2026. Qwen3.8-Max overtook GPT-5.6 Sol. LMArena Search 1260.
- Oct 25, 2026. GPT-5.6 Sol is the first leader on record. LMArena Search 1261.
Questions
Is Diffbot-Small-XL or GPT-5.6 Sol better for research & web search?
GPT-5.6 Sol ranks ahead for research & web search on LMArena Search. Diffbot-Small-XL is the open weights pick (1062); GPT-5.6 Sol is the alternative pick (1258).
Which is cheaper, Diffbot-Small-XL or GPT-5.6 Sol?
Diffbot-Small-XL: The weights are under Apache 2.0. A hosted search API may be paid. GPT-5.6 Sol: Uses a ChatGPT plan. Check the plan page for the current price.
Can I use Diffbot-Small-XL or GPT-5.6 Sol for free?
Diffbot-Small-XL: The weights are free to download. GPT-5.6 Sol: A free plan may include limited search.
Which is more private, Diffbot-Small-XL or GPT-5.6 Sol?
Diffbot-Small-XL (Diffbot): Privacy default not checked. GPT-5.6 Sol (OpenAI): Yes on personal Free, Plus, and Pro. Improve the model for everyone is on by default.