Which is cheaper, Claude Opus 5.5 and Mistral Nemo?

Mistral Nemo has the lowest input price. Per 1M input tokens: Claude Opus 5.5 from $4.00 and Mistral Nemo from $0.03.

Which has the larger context window, Claude Opus 5.5 and Mistral Nemo?

Claude Opus 5.5 has the largest context window: Claude Opus 5.5 1,000,000 tokens and Mistral Nemo 131,072 tokens.

Which is smarter, Claude Opus 5.5 and Mistral Nemo?

Claude Opus 5.5 scores highest on the Artificial Analysis Intelligence Index: Claude Opus 5.5 58.4 and Mistral Nemo 5.2.

Can I switch between Claude Opus 5.5 and Mistral Nemo without changing my code?

Yes. All of them are served through FastRouter's OpenAI-compatible API, so switching is a change of the model parameter (anthropic/claude-opus-5.5, mistralai/Mistral-Nemo-Instruct-2407).

Claude Opus 5.5 vs Mistral Nemo

Side-by-side pricing per provider, context window, benchmark scores and speed, all on one OpenAI-compatible API.

Estimate monthly cost for these models

Claude Opus 5.5 Anthropicanthropic/claude-opus-5.5

Mistral Nemo MistralAImistralai/Mistral-Nemo-Instruct-2407

Creator

Anthropic

MistralAI

Released

Sep 22, 2026

Jul 19, 2024

Context window

131K

Max output

128K

16K

Input / 1MLowest provider price

$4.00

$0.03

Output / 1MLowest provider price

$20.00

$0.03

Providers

IntelligenceArtificial Analysis index

58.4

5.2

LatencyMedian time to first token

—

3.3s

ThroughputMedian tokens per second

—

<1 t/s

Accepts

Text, Image, Files

Text

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Yes

Claude Opus 5.5 vs Mistral Nemo: summary

Claude Opus 5.5 and Mistral Nemo are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

Claude Opus 5.5, from Anthropic, has a 1,000,000-token context window, costs from $4.00/1M input and $20.00/1M output tokens across 3 providers and scores 58.4 on the Artificial Analysis Intelligence Index.

Mistral Nemo, from MistralAI, has a 131,072-token context window, costs $0.03/1M input and $0.03/1M output tokens and scores 5.2 on the Artificial Analysis Intelligence Index.

Mistral Nemo is the cheapest on input, 133× cheaper than the next model, Claude Opus 5.5 has the largest context window and Claude Opus 5.5 scores highest for intelligence.

Switch with one line

client = OpenAI(base_url="https://api.fastrouter.ai/api/v1", api_key="<FASTROUTER_API_KEY>") client.chat.completions.create(model="anthropic/claude-opus-5.5", messages=[...]) # or client.chat.completions.create(model="mistralai/Mistral-Nemo-Instruct-2407", messages=[...])

Full API docs

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More comparisons

Benchmark scores sourced from ArtificialAnalysis