Gemini 3.8 Flash on finance benchmarks
It ranks second on Finance Agent v2 at less than half the token price of Gemini 4 Argon, and it answers in about a fifth of the time.
What it is
Gemini 3.8 Flash is Google's faster, cheaper model line, released September 2, 2026, with a 1M-token context window and 66k output tokens. Developer documentation listed by Vals: ai.google.dev.
| Developer | |
|---|---|
| Release date | Sep 2, 2026 |
| Context window | 1M tokens |
| Weights | Private |
| Public API price | $1.50 input / $7.50 output per million tokens, listed (source) |
What published results say
| Benchmark | Score | Rank | Context |
|---|---|---|---|
| Finance Agent v2 | 61.44% | #2 of 78 | Context: n=450 test questions, 3 runs · Oct 12, 2026 leaderboard · Vals AI · ±0.13 SEM |
| Excel Modeling Benchmark | 72.20% | #8 of 74 | Context: n=51 test tasks · Oct 12, 2026 leaderboard · Vals AI · ±2.42 as published, type not stated |
| Tax Agent Bench | 32.12% | #18 of 69 | Context: n=193 test questions · Oct 12, 2026 leaderboard · Vals AI · ±3.37 as published, type not stated |
- Strict All-Pass score on Finance Agent v2 (every check must pass): 49.69% Context: n=450 test questions, 3 runs · Oct 12, 2026 leaderboard · Vals AI · margin: not disclosed
- Finance Agent v2 cost and time per task: $2.00, 3m21s.
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
- Strong on analyst research and Excel modeling, much weaker on corporate tax research (18th of 69 on Tax Agent Bench).
- Same-family judge caveat as other Google models: Gemini 3.1 Pro sits on the Finance Agent v2 jury.
- Benchmarks measure research and modeling answers, not trading results.
Head-to-head
Primary sources
- VerifiedGemini 3.8 Flash 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.
- LinkedDeveloper documentation (Google)Linked by Vals AI. Not re-checked by us.
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