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Head-to-head comparison

GPT-5.1-Codex-Mini vs Laguna S 2.1

GPT-5.1-Codex-Mini (OpenAI) and Laguna S 2.1 (Poolside) 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 3 September 2026

As of 3 September 2026, Laguna S 2.1 holds the stronger ModelCap Index position (#68 vs #69); Laguna S 2.1 is 11.1× cheaper per output token ($0.18/1M vs $2.00/1M); and Laguna S 2.1 offers the longer context window (1M vs 400K tokens).

Which should you choose?

Choose GPT-5.1-Codex-Mini if…

  • ModelCap publishes no field on which GPT-5.1-Codex-Mini leads Laguna S 2.1 for this pair.

Choose Laguna S 2.1 if…

  • you want the stronger overall ModelCap Index position — #68 against #69 (40.3 vs 40.2 points).
  • API cost matters — $0.18/1M output tokens against $2.00/1M, about 11.1× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.09/1M against $0.25/1M.
  • you need the longer context window — 1M tokens against 400K.
  • you want the more recently listed model — Laguna S 2.1 was listed 21 July 2026, GPT-5.1-Codex-Mini 13 November 2025.

GPT-5.1-Codex-Mini vs Laguna S 2.1: specs, pricing and context

Specification comparison of GPT-5.1-Codex-Mini and Laguna S 2.1
FieldGPT-5.1-Codex-MiniOpenAILaguna S 2.1Poolside
ModelCap Index position#69#68
Index score40.240.3
EvidenceMeasuredEstimated
Input price / 1M tokens$0.25$0.09
Output price / 1M tokens$2.00$0.18
Context window400K tokens1M tokens
Max output tokens128K131K
API providers listed11
Weight accessAPI onlyRestricted license
Input modalitiesImage, TextText
First listed13 November 202521 July 2026
PublisherOpenAIPoolside

Evidence: 1 public benchmark observation across 1 board · placed against measured peers on publisher-reported benchmarks, discounted for self-report optimism. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: GPT-5.1-Codex-Mini vs Laguna S 2.1

Public benchmark boards where GPT-5.1-Codex-Mini or Laguna S 2.1 has a published result
BoardGPT-5.1-Codex-MiniLaguna S 2.1Leads
AA Intelligence IndexArtificial Analysis31.3intelligence-index—Only one result
AA τ²-Bench TelecomArtificial Analysis62.9%tau2-bench-telecom—Only one result
AA Humanity's Last ExamArtificial Analysis18.5%humanitys-last-exam—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.

GPT-5.1-Codex-Mini vs Laguna S 2.1: common questions

Is GPT-5.1-Codex-Mini better than Laguna S 2.1?

Laguna S 2.1 ranks higher on the ModelCap Index as of 3 September 2026: #68 against #69. 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 GPT-5.1-Codex-Mini cheaper than Laguna S 2.1?

Laguna S 2.1 is cheaper on output tokens: $0.18/1M against $2.00/1M. Input tokens are $0.25/1M for GPT-5.1-Codex-Mini and $0.09/1M for Laguna S 2.1. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, GPT-5.1-Codex-Mini or Laguna S 2.1?

Laguna S 2.1 has the larger context window: 1M tokens against 400K.

Which is better for coding, GPT-5.1-Codex-Mini or Laguna S 2.1?

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 GPT-5.1-Codex-Mini and Laguna S 2.1 open-weight models?

GPT-5.1-Codex-Mini: API only. Laguna S 2.1: Restricted license. 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 GPT-5.1-Codex-Mini and Laguna S 2.1?

ModelCap currently lists 1 API provider for GPT-5.1-Codex-Mini and 1 for Laguna S 2.1, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this GPT-5.1-Codex-Mini vs Laguna S 2.1 comparison?

Every figure comes from the sealed ModelCap dataset published 3 September 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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