Claude Opus 5.5 on finance benchmarks
It is mid-pack on Finance Agent v2 but second on both the Excel Modeling Benchmark and Tax Agent Bench.
What it is
Claude Opus 5.5 is Anthropic's flagship model, released September 22, 2026, with a 1M-token context window and 128k output tokens. Vals AI ran it with compute effort set to max. Developer documentation listed by Vals: docs.claude.com.
| Developer | Anthropic |
|---|---|
| Release date | Sep 22, 2026 |
| Context window | 1M tokens |
| Weights | Private |
| Public API price | $4.00 input / $20.00 output per million tokens, listed (source) |
What published results say
| Benchmark | Score | Rank | Context |
|---|---|---|---|
| Finance Agent v2 | 58.59% | #10 of 78 | Context: n=450 test questions, 3 runs · Oct 12, 2026 leaderboard · Vals AI · ±0.17 SEM |
| Excel Modeling Benchmark | 75.94% | #2 of 74 | Context: n=51 test tasks · Oct 12, 2026 leaderboard · Vals AI · ±2.38 as published, type not stated |
| Tax Agent Bench | 45.57% | #2 of 69 | Context: n=193 test questions · Oct 12, 2026 leaderboard · Vals AI · ±3.59 as published, type not stated |
- Finance Agent v2 cost and time per task: $9.22, 33m08s.
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
- Most expensive and slowest per Finance Agent v2 task among the models in this directory: $9.22 and 33 minutes 8 seconds.
- Vals ran it with Claude Opus 5 and Opus 4.8 as server-side fallbacks for refusals; the model page reports a fallback rate of 2.15% Context: n: not disclosed · Vals Index runs, Sep 2026 · Vals AI · margin: not disclosed.
- Claude Sonnet 4.6, from the same family, sits on the Finance Agent v2 jury.
- Benchmarks measure research and modeling answers, not trading results.
Head-to-head
Primary sources
- VerifiedClaude Opus 5.5 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 (Anthropic)Linked by Vals AI. Not re-checked by us.
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