Chat and everyday writing
Pi
Made by Inflection
Inflection's conversational assistant — patient and question-asking rather than sharp.
What it is
Pi is built to talk with rather than produce for. Ask it something and it tends to ask you something back, which is exactly wrong if you want a finished cover letter and exactly right when you don't yet know what you're trying to decide.
I list it for the moments before the work: talking through whether to change field at all, rehearsing a difficult conversation with a manager, getting unstuck when you can't even phrase the question.
It is free, with no consumer plan published — Inflection sells to businesses instead. Don't expect it to draft your documents.
Published price
- Pi (web, iOS, Android, WhatsApp)No subscription, no premium tier and no in-app purchase; rate limits apply to stop abuse$0
- Inflection for EnterpriseBusiness deployments only — no list price anywhereQuoted by their sales team
Inflection publishes no consumer price list because the consumer product is entirely free; the company sells to businesses instead.
Source: Inflection's Pi site · Last checked 17 September 2026
Benchmarks
The published figures for Pi, copied exactly as their sources give them and checked 17 September 2026. Each one names the test, who ran it and when, and says when the number comes from the maker rather than an independent tester.
- OpenUGI31.5
willingness and ability to answer awkward open-ended questions · tested: Inflection-3 Pi
Benchmark List · 6 May 2026 · independent
Not a general-capability test; no MMLU, GPQA or LMArena entry exists for Pi.
- Aggregate claim against GPT-4 (no per-test figures released)"over 94% of GPT-4's average performance", on 40% of the training compute
the maker's own summary across a set of benchmarks it chose · tested: Inflection-2.5, the model behind Pi
Inflection's launch announcement, reported by VentureBeat · 7 March 2024 · maker's own figures
An averaged claim, not a score: Inflection never published the per-benchmark table, its own page for the model is gone, and GPT-4 is two generations old. Read it as history.
Pi is barely benchmarked — Inflection stopped competing on leaderboards. The one current figure is from a niche test, so treat it as a curiosity rather than a ranking.
Figures copied from the sources above, checked 17 September 2026.
Where to read today's numbers
Scores move, so these are the boards that keep them current.
- LMArena leaderboardIndependent
Ranks models by blind head-to-head votes from the public. Good for a feel for general quality, weak on specialist work.
- Inflection's own benchmark postsMaker's own figures
The company's own published comparisons. Read them as marketing, not measurement.
How it performs, in my experience
Conversational and patient rather than sharp — it asks questions back instead of producing walls of text.
Free value
5 / 5
How much you get without paying.
Performance
3 / 5
How well it does its main job.
Range of uses
2 / 5
How many different jobs it suits.
Free and calming to talk to, but not the one for producing finished work. These scores are my own judgment, not a measurement — the benchmark links above are the independent version.
Prompting it from this site
Can't be run from here
Inflection publishes no API for Pi, so there is nothing to send a prompt to.
Use it for
- Talking through a career decision
- Rehearsing a difficult conversation
- Getting unstuck when you don't know what to ask
Running it yourself
Hosted only — nothing to install
Pi is a closed, hosted assistant with no public API and no downloadable weights. There is no way to run it yourself.
What you need first
- A browser, or the Pi mobile app
Step by step
1.Use it at pi.ai — nothing to install
If what you want is a warm, conversational model running privately on your own machine, an open chat model through Ollama is the closest substitute.