Mistral Medium 3.5 Open vs 
Seed 2.1 Turbo Paid
Mistral Medium 3.5 vs Seed 2.1 Turbo compared — price per token, context window, multimodality, openness and which to choose. Can the open-source model replace the paid one? Full 2026 breakdown.
Seed 2.1 Turbo — full profile ›
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
$7.5 /M outputNo per-token fees if you self-host
$2.5 /M outputManaged API (no infra to run)
Mistral Medium 3.5 vs Seed 2.1 Turbo specs
| Spec | Mistral Medium 3.5 | Seed 2.1 Turbo | Winner |
|---|---|---|---|
| Maker | Mistral AI | ByteDance Seed | – |
| Type | Open-weight | Proprietary | |
| Context window | 262K tokens | 262K tokens | = Tie |
| Input price | $1.5/M · free self-host | $0.5/M | |
| Output price | $7.5/M · free self-host | $2.5/M | |
| Vision / multimodal | Yes | Yes | = Tie |
| Tool / function calling | Yes | Yes | = Tie |
| Self-hostable | Yes | No (API only) | |
| License | Apache 2.0 | Proprietary |
Price gap & when to choose each
Seed 2.1 Turbo is ~3.0× cheaper than Mistral Medium 3.5 on output tokens ($2.5 vs $7.5 per M tokens).
- You want to self-host or run on your cloud
- You prioritize data privacy & control
- You are building open or reproducible AI
- You want frontier performance through a managed API
- You want the lower output price
- You value reliability & ecosystem
- You don't want to manage infrastructure
Feature comparison
| Capability | Mistral Medium 3.5 | Seed 2.1 Turbo |
|---|---|---|
| Open weights (downloadable) | ✓ | ✗ |
| Self-hostable | ✓ | ✗ |
| Runs fully offline | ✓ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✗ | ✗ |
Benchmarks: Mistral Medium 3.5 vs Seed 2.1 Turbo
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How Mistral Medium 3.5 and Seed 2.1 Turbo score
| Criterion | Mistral Medium 3.5 | Seed 2.1 Turbo |
|---|---|---|
| Cost-efficiency | 4.0 | 4.5 |
| Context window | 4.0 | 4.0 |
| Openness | 5.0 | 1.5 |
| Self-hosting | 5.0 | 1.0 |
| Multimodality | 5.0 | 5.0 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
Mistral Medium 3.5 Open
Mistral Medium 3.5 is a dense 128B instruction-following model from Mistral AI. It supports text and image inputs with text output, and is designed for agentic workflows, coding, and complex...
Seed 2.1 Turbo Paid
Seed 2.1 Turbo is a multimodal model from ByteDance Seed for coding and long-horizon agent workflows. It is suited for end-to-end software delivery, multi-step task execution, and understanding visual and...
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
Is Mistral Medium 3.5 as good as Seed 2.1 Turbo?
Mistral Medium 3.5 is open-weight and competitive on many tasks, but Seed 2.1 Turbo may still lead on the hardest reasoning and agentic work. The gap keeps narrowing — benchmark both on your actual use case before deciding.
Can I run Mistral Medium 3.5 locally?
Yes. Mistral Medium 3.5 has open weights, so you can self-host it on your own GPUs or run it via a low-cost API. Seed 2.1 Turbo is API-only and cannot be self-hosted.
Mistral Medium 3.5 vs Seed 2.1 Turbo — which should I pick in 2026?
Choose Mistral Medium 3.5 if you want to self-host, keep your data private and skip per-token fees — it's open-weight and runs on your own hardware. Choose Seed 2.1 Turbo if you want frontier capability through a managed API with zero infrastructure to run.
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