$ diff gpt-6-1-sol k2-horizon
GPT-6.1 Sol vs K2 Horizon
Values come from GPT-6.1 Sol and K2 Horizon, where each is cited to its source. This page states no benchmark result and ranks neither model — it puts two published specifications next to each other. Where a lab has not published a figure, the row says so rather than guessing.
OpenAIGPT-6.1 Sol
- context
- 1.1M
- weights
- closed
- $/M in
- $2
- $/M out
- $10
- context
- 524K
- weights
- open
- $/M in
- —
- $/M out
- —
What actually differs
- Context window
- GPT-6.1 Sol takes 1.1M against 524K — 2.0× more room in a single request.
- Weights
- K2 Horizon publishes weights (Apache 2.0 (weights and code)); GPT-6.1 Sol is API-only. That decides self-hosting, air-gapped deployment and fine-tuning before any capability question does.
- Recency
- GPT-6.1 Sol shipped 26 days after K2 Horizon (2026-09-29 vs 2026-09-03).
Full spec
| Attribute | GPT-6.1 Sol | K2 Horizon |
|---|---|---|
| Developer | OpenAI | Ifm |
| Released | 2026-09-29 | 2026-09-03 |
| Context window | 1.05M tokens | 524,288 (flagship 375B-A23B, native from midtraining onward) |
| Pricing | $2/M input · $10/M output · cached input $0.10/M | not recorded |
| License | proprietary (API-only; no weight release) | Apache 2.0 (weights and code) |
| Availability | OpenAI API; Codex; ChatGPT Work — surfaces named in reporting, not enumerated by a first-party page | Hugging Face (weights, code, checkpoints, training data where redistributable) |