Model catalog

Living map of model string → emission class used by carbonmd-factors-2026-08.

This page is steered weekly (Sunday evening, Europe/Zurich): new public releases and models seen in agent usage are classified, documented here, and wired into src/core/factors.ts.

Last steered: 2026-09-20<br> Factors version: carbonmd-factors-2026-08

How to read this

• Classes feed the gCO₂e bands in Methodology & factors.
• Matching is heuristic and honest — unknown strings fall to medium + guessed: true.
• Small markers win first (mini, flash, luna, fast, lightning…), so tiered families classify correctly.

Frontier

High-capability flagships. Central 4.5 gCO₂e / 1k output tokens.

Large

Workhorse coding / agent models. Central 2.5 gCO₂e / 1k output tokens.

Small

Cheap / fast tiers. Central 0.15 gCO₂e / 1k output tokens.

Decision note (2026-08 steer): grok-composer-2.5-fast is classified small, not large. The composer … fast naming marks xAI's cheap/fast tier, and the explicit composer + fast rule wins over the generic grok → large family rule. This is a deliberate behavior change vs the pre-2026-08 catalog; it lowers the central estimate for that model from 2.5 to 0.15 gCO₂e / 1k output tokens.

Decision note (2026-08-16 steer): grok-4.6 stays large, not frontier. OpenRouter describes it as xAI's smartest coding/STEM model; the catalog still treats the whole grok family as the large workhorse band, consistent with grok-4.3 / grok-4.5. qwen3.8-max / qwen3.8-2.4t-a95b stay large for the same family-rule reason (qwen → large), matching qwen3.7-max. seed-2-1-turbo is large (coding/agent workhorse); lite/mini Seed IDs remain small.

Decision note (2026-08-23 steer): z-ai/glm-5.3 stays large (glm family, reasoning / agent workhorse). meta/muse-spark-1.2-contributor stays large — contributor is not a small marker; the muse family rule wins even though the contributor SKU is cheaper than Spark. Tencent hy-mt2* (Hunyuan-MT translation specialists, including 30b-a3b with 3B active) is classified small. deepseek-v4-flash-vision-exp is small via flash.

Decision note (2026-08-30 steer): stealth/ox-alpha is classified small, not medium/guessed. Z.ai unmasked it on 2026-08-26 as GLM-5.3-Flash (320B-A18B). The flash marker already maps glm-5.3-flash / qwen3.8-flash-next to small; the explicit ox-alpha rule keeps the stealth ID aligned with that SKU. glm-5.3 (non-flash) stays large. Factor bands unchanged.

Decision note (2026-09-06 steer): gpt-6-astra / gpt-6-astra-pro are classified frontier, not medium/guessed. OpenAI's GPT-6 flagship began a phased rollout on 2026-09-03 (API IDs also listed as openai/gpt-6-astra). The gpt-6 rule is checked after small markers, so a hypothetical gpt-6-mini / luna still lands small. claude-fable-5.1 and claude-mythos-5.1 stay frontier via existing fable / mythos. gemini-3.8-flash (and the Fairwind-gated Cyber variant) is small via flash. muse-spark-1.3 / muse-spark-1.3-contributor stay large via muse. qwen3.8-max-0902 stays large via qwen. ibm-granite/granite-4.2-8b is small via 8b. inception/mercury-2.5-preview is classified small (diffusion LLM, vendor-compared to Luna / Flash-Lite / Haiku). tencent/hy4-preview is large (Hunyuan 4, 770B-A49B coding flagship) — the hy-mt translation family remains small; hy4 is a different product. Factor bands unchanged. No new uncatalogued IDs in Hermes usage this week. Decision note (2026-09-13 steer): deepseek-v4.1-flash / deepseek/deepseek-v4.1-flash / API alias deepseek-flash are small via flash. DeepSeek launched V4.1-Flash on 2026-09-10 (MIT weights; older V4 Flash / Flash Vision API names now route here). gemini-3.8-flash-cyber stays small via flash. inclusionai/ling-3.0-flash-fin is small via flash. meituan/longcat-2.0 (and :free) is classified large, not medium/guessed — Meituan LongCat-2.0 is a 1.6T-A48B coding workhorse, same band as Kimi / DeepSeek-Pro / Qwen-Max. Factor bands unchanged. Decision note (2026-09-20 steer): Moonshot's kimi-k2.8-preview is large through the existing kimi family rule; its Kimi Code rollout also retains the kimi-for-coding endpoint. Shanghai AI Lab's Atria-Dawn-Preview is large, not medium/guessed: it is a 744B agentic-MoE release built on the GLM-5.2 lineage, so an explicit atria rule aligns it with GLM/Kimi/DeepSeek workhorses. Hermes usage also contains upstage/solar-pro4:free; Upstage describes Solar Pro 4 as its 512K-context agentic LLM, and the explicit solar-pro rule maps it large. The complete gpt-5.2-codex, gpt-5.3-codex, and gemini-3.1-flash-lite-preview IDs were documented as already-covered family variants. Factor bands unchanged.

Medium (guessed)

Anything without a known marker. Central 0.8 gCO₂e / 1k output tokens, range widened in status.

No new guessed IDs this week.

If your production model lands here, open an issue or wait for the weekly steer.

Weekly steer

Every Sunday 20:00 Europe/Zurich, Hermes:

1. Scans public release notes + Hermes session_model_usage for new model IDs
2. Proposes class mappings (frontier / large / medium / small)
3. Updates factors.ts + this page + methodology examples
4. Rebuilds and deploys docs.carbonmd.dev ↗
5. Reports what changed

No silent factor-band rewrites: class values (gCO₂e table) only change with an explicit factors version bump and human review.

Related

• carbon-md factors — print the active table from the CLI
• Methodology — derivation and token rules
• GitHub issues ↗ — suggest a mapping