# ESG and carbon reporting: what AI models recommend, September 2026

Gane Index, September 2026 Edition. Asked as "ESG reporting software" and as "carbon accounting platform", six framings each, to twelve models with search on, on behalf of a mid-market B2B company. Page: https://www.gane.ai/index/finance/corporate/esg-and-carbon-reporting/2026-09

This is the permanent record of the September 2026 Edition, published September 17, 2026 and superseded since. The current standing: https://www.gane.ai/index/finance/corporate/esg-and-carbon-reporting/index.md

**Standing:** Sweep leads with 25% of first choices; verdict contested. 52 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| Rank | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | [Sweep](https://www.gane.ai/index/finance/vendors/sweep/index.md) | 25% | 3% | 37 |
| 2 | [Greenly](https://www.gane.ai/index/finance/vendors/greenly/index.md) | 13% | 8% | 26 |
| 3 | [Novisto](https://www.gane.ai/index/finance/vendors/novisto/index.md) | 10% | 7% | 27 |
| 4 | [Plan A](https://www.gane.ai/index/finance/vendors/plan-a/index.md) | 10% | 7% | 14 |
| 5 | [Coolset](https://www.gane.ai/index/finance/vendors/coolset/index.md) | 8% | 0% | 19 |
| 6 | [EcoOnline ESG](https://www.gane.ai/index/finance/vendors/ecoonline-esg/index.md) | 8% | 0% | 12 |
| 7 | [Persefoni](https://www.gane.ai/index/finance/vendors/persefoni/index.md) | 6% | 4% | 28 |
| 9 | [Workiva ESG](https://www.gane.ai/index/finance/vendors/workiva-esg/index.md) | 4% | 29% | 35 |
| 15 | [Watershed](https://www.gane.ai/index/finance/vendors/watershed/index.md) | 0% | 17% | 18 |
| 16 | [Diligent ESG](https://www.gane.ai/index/finance/vendors/diligent-esg/index.md) | 0% | 9% | 11 |
| 17 | [SAP Sustainability Control Tower](https://www.gane.ai/index/finance/vendors/sap-sustainability-control-tower/index.md) | 0% | 17% | 12 |
| 18 | [Normative](https://www.gane.ai/index/finance/vendors/normative/index.md) | 0% | 10% | 10 |

Rank is by share of first choices among all 75 products named; products with the same share are tied, and the order among them carries no meaning. The table lists those with at least 10 labels.

## Each model's first choice on the direct prompt

- Claude Haiku 4.5: EcoOnline ESG; alternatives Greenstone, Normative, SpheraCloud Corporate Sustainability, Sweep
- GPT-5.4 mini: Workiva ESG; alternatives IBM Envizi, Novisto, SpheraCloud Corporate Sustainability
- Gemini 3.5 Flash: Greenly, Sweep; alternatives Coolset, Novata
- Perplexity Sonar: Novisto; alternatives EcoOnline ESG, Greenly, Novata, Sweep
- Grok 4.20: Sweep; alternatives Coolset, Novisto
- Mistral Small: Sweep; alternatives Coolset, EcoOnline ESG
- DeepSeek V4 Flash: Sweep; alternatives Coolset, Greenly, Plan A, Tanso
- Llama 4 Maverick: EcoOnline ESG, Novisto, Sweep
- Qwen 3.7 Flash: Novisto; alternatives Gravity, LogicGate, Sweep
- Kimi K2: Novisto; alternatives Coolset, Sustain.Life, Sweep, Workiva ESG
- GLM 4.7 FlashX: Novisto; alternatives EcoOnline ESG, Greenly, Sustain.Life, Sweep
- MiniMax M2.5: EcoOnline ESG, Sweep; alternatives Coolset, Normative, Novisto, Plan A

## Sources the answers cite

68 of 72 answers came back with a source list, from 12 of 12 models. Sites named in the most answers:

- guideflow.com: 39 answers, 41 citations
- coolset.com: 37 answers, 44 citations
- gartner.com: 31 answers, 35 citations
- emissiontwin.com: 25 answers, 25 citations
- pulsora.com: 23 answers, 24 citations
- g2.com: 20 answers, 36 citations
- esg-one.co: 16 answers, 17 citations
- onestopesg.com: 15 answers, 16 citations

Pages named in the most answers:

- https://guideflow.com/blog/esg-reporting-software (39 answers)
- https://coolset.com/academy/best-esg-reporting-software-tools (34 answers)
- https://gartner.com/reviews/market/esg-management-and-reporting-software (31 answers)
- https://pulsora.com/blog/best-esg-reporting-software (22 answers)
- https://emissiontwin.com/blog/best-esg-reporting-software (21 answers)
- https://esg-one.co/blog/esg-reporting-software-comparison (15 answers)
- https://sopact.com/use-case/esg-reporting-platforms (12 answers)
- https://sustaenia.com/learn/the-best-esg-tools (11 answers)
- https://aibusinessgeek.com/articles/ai-esg-reporting-software-2026 (10 answers)
- https://energycap.com/blog/sustainability-reporting-platform (10 answers)

## Warned against

- IBM Envizi: 9 of 25 labels negative. "Some consultants and industry observers recommend steering clear of ESG solutions from major tech firms" (Mistral Small, negative prompt)
- Workiva ESG: 10 of 35 labels negative. "| Workiva | $50K–$150K+ (likely overkill) | Skip unless you need integrated financial + ESG reporting |" (DeepSeek V4 Flash, scale prompt)
- Salesforce Net Zero Cloud: 6 of 11 labels negative. "recommend steering clear of ESG solutions from major tech firms, as these may not be as specialized or effective" (Mistral Small, negative prompt)
- Watershed: 3 of 18 labels negative. "Some enterprise platforms like Watershed assume dedicated sustainability staff and full custom pricing with no standard SMB tier or transparent pricing." (Claude Haiku 4.5, paraphrase prompt)

## Record

- Method: https://www.gane.ai/index/finance/methodology
- License: CC BY 4.0. Cite as Gane Index, September 2026 Edition, www.gane.ai/index/finance.