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Head-to-head comparison

Llama 3.1 8B Instruct vs Sonar Pro

Llama 3.1 8B Instruct (Meta) and Sonar Pro (Perplexity) 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, Sonar Pro holds the stronger ModelCap Index position (#199 vs #214); Llama 3.1 8B Instruct is 187.5× cheaper per output token ($0.08/1M vs $15.00/1M); and Sonar Pro offers the longer context window (200K vs 131K tokens).

Which should you choose?

Choose Llama 3.1 8B Instruct if…

  • API cost matters — $0.08/1M output tokens against $15.00/1M, about 187.5× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.05/1M against $3.00/1M.
  • you want provider choice — 5 listed API providers against 1.

Choose Sonar Pro if…

  • you want the stronger overall ModelCap Index position — #199 against #214 (8.6 vs 3.9 points).
  • you need the longer context window — 200K tokens against 131K.
  • you want the more recently listed model — Sonar Pro was listed 7 March 2025, Llama 3.1 8B Instruct 23 July 2024.

Llama 3.1 8B Instruct vs Sonar Pro: specs, pricing and context

Specification comparison of Llama 3.1 8B Instruct and Sonar Pro
FieldLlama 3.1 8B InstructMetaSonar ProPerplexity
ModelCap Index position#214#199
Index score3.98.6
EvidenceMeasuredMeasured
Input price / 1M tokens$0.05$3.00
Output price / 1M tokens$0.08$15.00
Context window131K tokens200K tokens
Max output tokens131K8K
API providers listed51
Weight accessGated accessAPI only
Input modalitiesTextText, Image
First listed23 July 20247 March 2025
PublisherMetaPerplexity

Evidence: 2 public benchmark observations across 2 boards · 1 public benchmark observation across 1 board. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Llama 3.1 8B Instruct vs Sonar Pro

Public benchmark boards where Llama 3.1 8B Instruct or Sonar Pro has a published result
BoardLlama 3.1 8B InstructSonar ProLeads
Arena codingArena (LMArena)12601252–1267—Only one result
BFCL V4UC Berkeley (Gorilla)25.8Prompt—Only one result
Artificial Analysis Intelligence IndexArtificial Analysis—9.1intelligence-indexOnly 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.

Llama 3.1 8B Instruct vs Sonar Pro: common questions

Is Llama 3.1 8B Instruct better than Sonar Pro?

Sonar Pro ranks higher on the ModelCap Index as of 18 August 2026: #199 against #214. 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 Llama 3.1 8B Instruct cheaper than Sonar Pro?

Llama 3.1 8B Instruct is cheaper on output tokens: $0.08/1M against $15.00/1M. Input tokens are $0.05/1M for Llama 3.1 8B Instruct and $3.00/1M for Sonar Pro. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, Llama 3.1 8B Instruct or Sonar Pro?

Sonar Pro has the larger context window: 200K tokens against 131K.

Which is better for coding, Llama 3.1 8B Instruct or Sonar Pro?

The two models do not share a coding benchmark board on ModelCap yet, so no head-to-head coding score is published; the ModelCap Index position is the closest overall signal.

Are Llama 3.1 8B Instruct and Sonar Pro open-weight models?

Llama 3.1 8B Instruct: Gated access. Sonar Pro: 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 Llama 3.1 8B Instruct and Sonar Pro?

ModelCap currently lists 5 API providers for Llama 3.1 8B Instruct and 1 for Sonar Pro, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Llama 3.1 8B Instruct vs Sonar Pro 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.

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