Grok 4.5 vs Mistral Medium 3.5
Pricing & Specs

xAI vs Mistral, side by side from a live registry. Specs below, then benchmark both on your own task.

Grok 4.5 output / 1M

$7.5

Mistral Medium 3.5 output / 1M

500K / 128K

context windows

TL;DR: On a typical task (1K input + 500 output tokens), Grok 4.5 and Mistral Medium 3.5 cost about the same. But per-token price is not cost per result: a cheaper model that needs more tokens, retries, or hand-holding can end up more expensive on your workload. The specs below are facts; which one is better at YOUR task is measurable, not guessable.

API Pricing: Grok 4.5 vs Mistral Medium 3.5

Tokens	Grok 4.5	Mistral Medium 3.5
Input	$2 / 1M	$1.5 / 1M
Output	$6 / 1M	$7.5 / 1M
Cached input	$0.3 / 1M	- / 1M

What that means in practice (1K input + 500 output tokens)

1x One typical task: $0.0050 on Grok 4.5 vs $0.0052 on Mistral Medium 3.5

1K 1,000 runs: $5.00 vs $5.25

💡 Real cost depends on how verbose each model is on YOUR prompts. Benchmark to measure actual tokens, not estimates.

Specs Compared

Spec	Grok 4.5	Mistral Medium 3.5
Context window	500K tokens	128K tokens
Max output tokens	-	-
Input modalities	text, image	text, image
Knowledge cutoff	-	-
Latency (measured)	-	~171ms median response
Reasoning model	Yes	No
Tool / function calling	Yes	Yes
JSON mode	Yes	Yes
Prompt caching	Yes	No

When to Choose Which

→ Long documents or big codebases: Grok 4.5 has the larger context window (500K vs 128K tokens).

→ Multi-step reasoning tasks: Grok 4.5 is a reasoning model; expect better step-by-step work at the cost of more output tokens.

→ Everything else: the honest answer is to benchmark both on your actual task. Quality differences are task-specific and shift with every release.

FAQ

Which is cheaper, Grok 4.5 or Mistral Medium 3.5?

Grok 4.5 costs $2/$6 per 1M input/output tokens; Mistral Medium 3.5 costs $1.5/$7.5. On a typical task (1K input + 500 output tokens), Grok 4.5 and Mistral Medium 3.5 cost about the same.

Which has the bigger context window, Grok 4.5 or Mistral Medium 3.5?

Grok 4.5 has a 500K-token context window; Mistral Medium 3.5 has 128K tokens.

Is Grok 4.5 better than Mistral Medium 3.5?

It depends on the task. Generic leaderboards won't tell you which one wins on YOUR workload. OpenMark lets you benchmark Grok 4.5 and Mistral Medium 3.5 head to head on your own task with real API calls, no API keys needed, free tier available.

Grok 4.5 or Mistral Medium 3.5 for YOUR Task?

Spec tables can't answer that. Run both head to head on your actual workload:
real API calls, ranked results with accuracy, cost, and latency. Free tier available.

Benchmark Both Free →

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