14-day free trial — 50 eval credits included

Stop Guessing Which LLM Wins. Let the Data Decide.

PeerLM runs blind comparative evaluations across 200+ AI models. Anonymized responses, LLM-judged rankings, per-persona breakdowns. Make model selection a science — not a debate.

Start Your First Evaluation View Pricing

14-day free trial · 50 eval credits · No credit card required

200+

AI Models

15+

LLM Providers

Evaluator Bias

<5 min

First Evaluation

Platform Capabilities

Evaluation infrastructure that enterprise AI teams actually trust

Built from first principles for rigorous, unbiased model comparison. Not another chatbot playground.

Blind Comparative Ranking

Evaluator models see anonymized, shuffled responses and rank without knowing the source — eliminating positional bias, name bias, and every other thumb on the scale.

Structured JSON Scoring

Models return structured arrays instead of free-text prose. Each item scored independently — granular, item-level performance data your analytics stack can actually use.

Persona-Based Evaluation

Test across different user personas with unique system prompts and criteria. See precisely which model excels for which audience and use case.

Per-Persona Leaderboards

Results break down by persona with best/worst performer identification, model rankings, and score distributions — the reporting quality your stakeholders expect.

Intelligent Response Caching

SHA-256 hashed cache keys mean identical prompts reuse responses at zero cost. Edit a prompt and the cache auto-invalidates — iteration is fast and cheap.

Deterministic Evaluation Mode

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

Select models, define user personas with system prompts, set topics, and specify criteria. Start from a template or build from scratch in minutes.

Blind Comparative Ranking

All responses are anonymized, shuffled, and sent to LLM judges. They rank candidates without knowing which model produced which response.

Actionable Intelligence

Per-persona leaderboards, model rankings, score matrices, raw response explorers. Share reports publicly or export as CSV/JSON for your data warehouse.

Before & After

From gut instinct to defensible data

Without PeerLM

With PeerLM

Eyeballing ChatGPT vs Claude in separate browser tabs

Automated blind ranking across dozens of real-world scenarios

Arbitrary 1–10 scores with no calibration or baseline

Relative ranking that surfaces true performance gaps

One prompt tested once, by one person

Batch evaluation across personas, topics, and criteria

No defensible answer to 'why did we choose this model?'

Audit-ready data your CTO and CFO can stand behind

Paying premium rates for models that may underperform

Data-driven selection with full cost-per-eval awareness

Pricing

Simple, transparent pricing

Start free. Upgrade when your evaluation needs scale.

Team

$499/mo

per workspace

1,000 eval credits/month
5 team members
API access & webhooks
Shareable public reports

Start Free Trial

Eliminate model uncertainty from your AI roadmap.

Join AI engineering teams running blind evaluations at scale. 14-day free trial. 50 eval credits. No card required.

Start Free Evaluation

Trusted by AI engineering teams shipping production LLM applications