openai

GPT-5.6 Luna

The $1-per-million tier went 5/5 for $0.30 — the second-cheapest perfect score in the matrix.

5/5

benchmarks passed

$0.296

spent in total

tool calls

What it is.

OpenAI's GPT-5.6 Luna — the fast/affordable tier of the July 2026 GPT-5.6 preview at $1/$6 per 1M tokens. The spiritual successor to GPT-5 Mini's price point with a 1.05M context window.

What it does well.

Five for five at $0.30 total — only Mistral Large 3 ($0.27) has done the matrix perfectly for less.
Now holds the single cheapest pass in the matrix: $0.021 on the Apollo pricing scrape, edging out Mistral.
CX in two tool calls and $0.06 — the benchmark that cost its flagship sibling the perfect score, done for a quarter of the price.

Where to be careful.

It reads more than it needs to: on Sales it scraped the full Crunchbase page before calling the Crunchbase tool, making its $0.089 Sales run the most expensive of the three tiers.
Preview model at preview pricing — the $1/$6 rate is the cheap-tier hook and may move at GA.
No data yet on long-horizon behavior; the 1.05M window invites big-context jobs this suite does not test.

Results by agent

Five real jobs.

SalesSales Research Analyst

Get financials on a company

Passed

Find Hightouch on Crunchbase and return their total funding, last round type, and a one-line description.

Three tool calls, $0.089. Scraped the whole Crunchbase page before using the Crunchbase tool — correct result, avoidable tokens.

MarketingMarketing Research Analyst

Find what customers are recommending on Reddit

Passed

Read a real r/sales thread on enrichment tools and rank the top 5 by how many people recommended them.

Five tool calls, $0.08. Dug up a thread with 12 mentions of the top tool and ranked all five with reasons.

CXCustomer Insights Analyst

Find what customers are complaining about

Passed

Pull Google Shopping reviews for AirPods Pro 2 (USB-C) and return the top 3 recurring complaints, with verbatim quotes.

Two tool calls, $0.06, exactly 3 complaints with verbatim quotes. The discipline its flagship sibling lacked.

CodingSenior Engineer Assistant

Read API docs and write working code

Passed

Read Stripe's official docs and write a real, working webhook-verification function in TypeScript.

Four tool calls, $0.046. Read the docs, wrote the verifier with timing-safe compare, cited the source.

Web ScrapingSales Outreach Specialist

Scrape a competitor's pricing page

Passed

Scrape Apollo.io's pricing page and return every tier (Free, Basic, Professional, Organization) with name, price, and top 3 features.

Two tool calls, $0.021 — the cheapest single pass in the matrix. All four Apollo tiers extracted.

All models Run GPT-5.6 Luna on your data