Model ML completes finance work more efficiently with GPT-5.6 Sol

Before financial analysis can stand up in front of clients or senior decision-makers, teams have to carry it through a demanding last mile: reconciling evidence, building and formatting the file, checking every number, and linking each claim to its source. The finished PowerPoint deck or Excel workbook has to be editable and ready for scrutiny.

Model ML cofounders and brothers Arnie and Chaz Englander saw how much work that required when, after two successful exits, they began investing through a private family office and, as builders do, building software to help themselves.

Grown out of that software, Model ML’s agents help finance professionals carry a workflow from the initial request through research, analysis, and a finished deck or workbook. At the center, a core agent plans the work, selects the right tools, reconciles evidence, and runs calculations, routing each step to the model best suited to it, which is often GPT‑5.6 Sol. Among those tools is Model ML’s own document tooling, which creates native PowerPoint and Excel files with traceable sources.

“Earlier models could do the work of an analyst, but the user would have to clearly break down the task, specifically what it wanted the output to look like. With GPT-5.6 Sol, we’re finding that the agent gets far closer to the final output.”

—Chaz Englander, Co-founder and CEO at Model ML

Solving the last mile of finance work

Model ML helps finance teams by automating finance workflows end to end. From a brief and source material, the agent can carry an assignment through research and modeling to finished materials for clients or deal teams. The finance professional checks the assumptions, sources, and message before sharing the work.

Model ML calls the product “surface-agnostic.” A finance professional can start an assignment in email, or the Model ML app, and continue it in its Microsoft Office plug-ins without explaining it again.

That continuity extends into the finished work. For an investment committee deck, Model ML can turn a brief and source material into an editable PowerPoint. For an Excel task, the agent can start with a client template or blank workbook, gather the required data, build formulas and logic across multiple tabs, then apply finance-specific formatting to produce a complete spreadsheet or financial model.

In Model ML’s Composite, the company’s evaluation benchmark for AI in financial services, GPT‑5.6 Sol used 36% fewer tokens per workbook than Opus 5 in an Excel workflow.

“The user should be focused on the judgment, such as refining the assumptions or sharpening the message, and not just rebuilding the analysis.”

By carrying the work through that last mile, the agent can also save time on individual deliverables and help teams process large volumes of source material. At one global asset manager, a bespoke tearsheet that took an analyst about an hour to assemble now takes about five minutes. In another workflow, Model ML agents processed virtual data rooms containing more than 100,000 rows and hundreds of files in one pass.

GPT‑5.6 Sol delivers more review-ready finance deliverables with fewer tokens

Model ML evaluated GPT‑5.6 Sol alongside other leading models across a range of finance workflows. Its Composite evaluations follow an assignment from the initial finance brief through research and calculations to an editable deck or spreadsheet, then check the numbers, sources, formulas, and structure, as well as visual quality for presentations.

For PowerPoint, Model ML’s Composite evaluation incorporates real workflows and spans hundreds of generated decks, with a detailed scoring rubric.

GPT‑5.6 Sol completed the PowerPoint workflow in 100% of test cases, compared with 76% for Opus 5, and cleared Model ML’s professional-readiness gate, a measure of whether the output was ready for substantive review, in 43.3% of cases, versus 26.7%. It also led Opus 5 on deck quality, brief adherence, hierarchy, and consistency.

Native PowerPoint creation model benchmark, Model ML’s Composite eval

Metric GPT 5.6 Sol Δ Sol–O5 Opus 5 Fable 5 Opus 4.8 GPT 5.6 Terra GPT-5.5 Deck quality — Overall score, readiness-gated 59.9% +3.2 56.7% 59.3% 58.7% 52.5% 44.4% Deliverability — Professional-readiness rate (gate) 43.3% +16.6 26.7% 32.0% 17.3% 17.3% 16.0% Deck produced — Items yielding a.pptx 100.0% +24.0 76.0% 82.0% 80.0% 80.0% 74.0% Brief adherence — Instruction following 78.8% +0.9 77.9% 78.5% 78.4% 74.1% 79.6% Visual quality — Aggregate visual judge — components below 77.9% −1.4 79.3% 78.9% 75.1% 74.4% 68.5% Layout — Layout & composition 75.9% −2.9 78.8% 78.7% 76.2% 76.1% 67.8% Hierarchy — Visual hierarchy 87.2% +0.5 86.7% 85.5% 85.5% 85.6% 83.7% Data viz — Chart legibility 78.8% −4.3 83.1% 79.7% 73.3% 74.6% 68.4% Consistency — Design coherence 97.8% +4.5 93.3% 95.8% 97.5% 75.0% 90.0% Efficiency — Tokens per deck (lower = better) 1.10M +144K 953K 1.40M 1.16M 720K 1.01M

Model ML’s native PowerPoint creation benchmark compares GPT‑5.6 Sol with Opus 5 and other leading models.

Native Excel creation model benchmark, Model ML’s Composite eval

Metric GPT 5.6 Sol Δ Sol–O5 Opus 5 Fable 5 Opus 4.8 GPT 5.6 Terra GPT-5.5 Key outputs correct — Headline accuracy vs golden model 83.3% +0.5 82.8% 80.6% 74.4% 82.2% 83.3% Fully correct models — Items with every key output right 50.0% −10.0 60.0% 60.0% 40.0% 53.3% 60.0% Outputs located — Expected outputs found in workbook 100.0% ±0 100.0% 100.0% 92.2% 98.9% 100.0% Workbook contract — Structure / no-errors / no-placeholder gates 100.0% ±0 100.0% 100.0% 100.0% 100.0% 100.0% Efficiency — Tokens per workbook (lower = better) 2.44M −1.40M 3.83M 2.59M 2.91M 1.64M 1.16M Wall clock — Minutes per workbook (lower = better) 7.0 min −0.5 min 7.5 min 8.4 min 11.5 min 4.2 min 3.9 min

Model ML’s native Excel creation benchmark compares GPT‑5.6 Sol with Opus 5 and other leading models.

Taken together, the Composite results shown above gave Model ML the evidence to expand GPT‑5.6 Sol in production, including some workflows previously handled by Opus 4.8. For PowerPoint workflows, GPT‑5.6 Sol combined competitive deck quality with a higher rate of completed, review-ready decks than Opus 5 and Fable 5, while using about 21% fewer tokens than Fable 5.

“Ready for real work means the user can move directly into real review,” says Englander. “The numbers trace back, the workbook recalculates, the slide is editable.”