Skip to content
ModelCap

Head-to-head comparison

Mistral Medium 3.5 vs Grok 4.20 Multi-Agent

Mistral Medium 3.5 (Mistral AI) and Grok 4.20 Multi-Agent (xAI) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 18 August 2026

As of 18 August 2026, Grok 4.20 Multi-Agent holds the stronger ModelCap Index position (#14 vs #38); Grok 4.20 Multi-Agent is 3× cheaper per output token ($2.50/1M vs $7.50/1M); and Grok 4.20 Multi-Agent offers the longer context window (2M vs 262K tokens).

Which should you choose?

Choose Mistral Medium 3.5 if…

  • you want the more recently listed model — Mistral Medium 3.5 was listed 30 April 2026, Grok 4.20 Multi-Agent 31 March 2026.

Choose Grok 4.20 Multi-Agent if…

  • you want the stronger overall ModelCap Index position — #14 against #38 (73.0 vs 53.9 points).
  • API cost matters — $2.50/1M output tokens against $7.50/1M, about 3× cheaper.
  • your workload is prompt-heavy — input tokens cost $1.25/1M against $1.50/1M.
  • you need the longer context window — 2M tokens against 262K.
  • Arena coding is your yardstick — 1508 against 1479.

Mistral Medium 3.5 vs Grok 4.20 Multi-Agent: specs, pricing and context

Specification comparison of Mistral Medium 3.5 and Grok 4.20 Multi-Agent
FieldMistral Medium 3.5Mistral AIGrok 4.20 Multi-AgentxAI
ModelCap Index position#38#14
Index score53.973.0
EvidenceMeasuredMeasured
Input price / 1M tokens$1.50$1.25
Output price / 1M tokens$7.50$2.50
Context window262K tokens2M tokens
Max output tokens——
API providers listed11
Weight accessAPI onlyAPI only
Input modalitiesText, Image, FileText, Image, File
First listed30 April 202631 March 2026
PublisherMistral AIxAI

Evidence: 4 public benchmark observations across 4 boards · 2 public benchmark observations across 2 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Mistral Medium 3.5 vs Grok 4.20 Multi-Agent

Public benchmark boards where Mistral Medium 3.5 or Grok 4.20 Multi-Agent has a published result
BoardMistral Medium 3.5Grok 4.20 Multi-AgentLeads
Arena codingArena (LMArena)14791468–149015081502–1514Beta · 0309Grok 4.20 Multi-Agent
LMArena AgentLMArena-7.0%-9.0%–-5.0%—Only one result
Artificial Analysis Intelligence IndexArtificial Analysis30.4intelligence-index—Only one result

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

Mistral Medium 3.5 vs Grok 4.20 Multi-Agent: common questions

Is Mistral Medium 3.5 better than Grok 4.20 Multi-Agent?

Grok 4.20 Multi-Agent ranks higher on the ModelCap Index as of 18 August 2026: #14 against #38. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it.

Is Mistral Medium 3.5 cheaper than Grok 4.20 Multi-Agent?

Grok 4.20 Multi-Agent is cheaper on output tokens: $2.50/1M against $7.50/1M. Input tokens are $1.50/1M for Mistral Medium 3.5 and $1.25/1M for Grok 4.20 Multi-Agent. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, Mistral Medium 3.5 or Grok 4.20 Multi-Agent?

Grok 4.20 Multi-Agent has the larger context window: 2M tokens against 262K.

Which is better for coding, Mistral Medium 3.5 or Grok 4.20 Multi-Agent?

Arena coding: Mistral Medium 3.5 1479, Grok 4.20 Multi-Agent 1508 — Grok 4.20 Multi-Agent leads.

Are Mistral Medium 3.5 and Grok 4.20 Multi-Agent open-weight models?

Mistral Medium 3.5: API only. Grok 4.20 Multi-Agent: API only. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run Mistral Medium 3.5 and Grok 4.20 Multi-Agent?

ModelCap currently lists 1 API provider for Mistral Medium 3.5 and 1 for Grok 4.20 Multi-Agent, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Mistral Medium 3.5 vs Grok 4.20 Multi-Agent comparison?

Every figure comes from the sealed ModelCap dataset published 18 August 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.

Explore further