GPT-5.6 Luna on finance benchmarks
It is the best-ranked OpenAI entry on Finance Agent v2 and one of the cheapest models in the top 25.
What it is
GPT-5.6 Luna is an OpenAI model released July 9, 2026, with a 1M-token context window, run by Vals AI at max reasoning effort.
| Developer | OpenAI |
|---|---|
| Release date | Jul 9, 2026 |
| Context window | 1M tokens |
| Weights | Private |
| Public API price | $0.20 input / $1.20 output per million tokens, listed (source) |
What published results say
| Benchmark | Score | Rank | Context |
|---|---|---|---|
| Finance Agent v2 | 55.04% | #22 of 78 | Context: n=450 test questions, 3 runs · Oct 12, 2026 leaderboard · Vals AI · ±0.31 SEM |
| Excel Modeling Benchmark | 67.12% | #17 of 74 | Context: n=51 test tasks · Oct 12, 2026 leaderboard · Vals AI · ±2.94 as published, type not stated |
| Tax Agent Bench | 24.82% | #37 of 69 | Context: n=193 test questions · Oct 12, 2026 leaderboard · Vals AI · ±3.11 as published, type not stated |
- Finance Agent v2 cost and time per task: $0.28, 12m52s.
What the benchmarks test: FAB v2, filing-based analyst research questions; EMB, building Excel financial models (LBO, DCF, M&A, comps); Tax Agent, research-grade US corporate tax questions, all-or-nothing grading. All three use held-out test sets and AI judges.
Limits
- On Tax Agent Bench it timed out on 8 of 193 test questions (4.1%) Context: n=193 test questions · Oct 12, 2026 leaderboard · Vals AI · not applicable (count), and each timeout scores zero.
- GPT-5.4, an earlier OpenAI model, sits on the Finance Agent v2 jury.
- Benchmarks measure research and modeling answers, not trading results.
Head-to-head
Primary sources
- VerifiedGPT-5.6 Luna model page (Vals AI)Scores, margins, release date, context window and token prices checked October 14, 2026.
- VerifiedFinance Agent v2 leaderboard and methodology (Vals AI)Sample size, grading and update date checked October 14, 2026.
- VerifiedExcel Modeling Benchmark leaderboard and methodology (Vals AI)Sample size, grading and update date checked October 14, 2026.
- VerifiedTax Agent Bench leaderboard and methodology (Vals AI)Sample size, grading and update date checked October 14, 2026.
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