Choose the perfect LLM and save thousands.
Stop burning budget on the wrong LLM and find the best one for the job. PeerLM runs blind evaluations across 200+ models to give you the data you need to choose the best model.
Free for individuals · 200+ models · No contracts
200+
Models Supported
15+
LLM Providers
0%
Zero Evaluator Bias
<5 min
First Results in Minutes
Why PeerLM
Every feature exists to remove bias and deliver clarity
Built from first principles for rigorous, unbiased model comparison. Not another chatbot playground.
Eliminate Name Bias from Every Decision
Evaluator models see anonymized, shuffled responses and rank without knowing the source. No positional bias, no brand favoritism — just raw performance data.
Get Granular, Exportable Performance Data
Structured JSON scoring means each item is scored independently — not buried in free-text prose. Export directly to your analytics stack or data warehouse.
Test Every Model Against Real User Scenarios
Define personas with unique system prompts and criteria, then see exactly which model excels for which audience. No more one-size-fits-all benchmarks.
See Which Model Wins for Each Use Case
Per-persona leaderboards with best/worst performer identification, model rankings, and score distributions — the reporting quality your stakeholders expect.
Cut Costs with Smart Response Caching
Identical prompts reuse cached responses instead of regenerating. Edit a prompt and the cache auto-invalidates — iterate without waiting on the same generations twice.
Get Reproducible Results Every Time
Pin temperature to 0 and fix seeds where supported. Capability checks ensure only valid parameters are sent — no silent failures, fully reproducible results.
How It Works
From configuration to insight in minutes
Set up an evaluation in minutes. Get results you can present to leadership.
Configure Your Evaluation
Pick models, define personas, set topics — minutes, not days. Start from a template or build from scratch.
Run Blind Rankings
Responses are anonymized, shuffled, and judged by LLM evaluators. No model knows it's being tested. No evaluator knows who produced what.
Get Data Your CTO Will Trust
Per-persona leaderboards, score matrices, and exportable reports. Share publicly or pipe into your data warehouse as CSV/JSON.
Before & After
What changes when guesswork ends
Without PeerLM
With PeerLM
Flipping between ChatGPT and Claude tabs, hoping you'll 'just know'
Automated blind ranking across dozens of real-world scenarios
Arbitrary 1–10 scores nobody can reproduce or defend
Relative ranking that surfaces true performance gaps
One prompt, tested once, by one person on a Friday afternoon
Batch evaluation across personas, topics, and criteria
'We went with GPT because… the team already had it open'
Audit-ready data your CTO and CFO can stand behind
Paying premium rates for models that underperform cheaper ones
Data-driven selection that can save 30–60% on model costs
Manually re-evaluating every time a provider drops a new model
Automatic comparison Runs triggered by model releases, price changes, and quality drift
Monitors
Ship model changes with confidence, not guesswork
Connect production traffic to a Monitor. PeerLM runs comparison Runs against candidates, then rolls quality retained and savings into a living switch / route / hold verdict.
Sources
SDK, file upload, Langfuse, Helicone, Cloudflare AI Gateway, or OpenTelemetry. Sync production traffic into each Monitor — no app rewrite required.
Comparison Runs
Each Run samples real traffic, replays candidates on the same inputs, and judges quality retained vs your control alongside cost.
Auto-Runs & Triggers
Weekly heartbeat, plus catalog, price, and drift. Team adds deploy triggers for Prompt CI. Run allowances keep the month bounded.
Living Verdict
Switch, route, or hold — refreshed by every Run. Quality retained, projected savings, Switch Confidence (SCS), and per-task routing you can export to LiteLLM, Portkey, or your own config.
Standing monitors start on Pro. Inference is included — you buy monitors and runs, not tokens.
Pricing
Simple, transparent pricing
Monitors, runs, and triggers — model inference included. No contracts — cancel anytime.
Free
forever free
- 1 sponsored comparison
- Standard + Advanced models
- 1 judge, handful of examples
- 1 seat
- Reports for 7 days
Pro
2 monitors · 10 runs/mo each
- 150 prompts, 2 candidates
- 5 judges from a pool of 8
- Weekly + catalog, price, drift
- Inference included
- Premium candidates, API & MCP
Team
6 monitors · 30 runs/mo each
- Everything in Pro
- Prompt CI & GitHub Action
- Deploy triggers, no debounce
- Prompt-as-variable runs
- Reports for 180 days
Enterprise
stated allowance per contract
- Everything in Team
- Frontier candidates
- Choose your own judges
- BYOK — judges and candidates
- Dedicated support & SLA
Standing monitors start on Pro. Inference is included in every paid plan.
Compare all plan featuresGet a free benchmark report for your team.
We'll run blind evaluations with your real prompts and deliver a report with clear model recommendations. Free for qualified teams.
Free for individuals · 200+ models · No contracts