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Comparison · 2 models · Updated Nov 2, 2026

GPT-6 Astra (Fast) vs Laguna S 2.1

Laguna S 2.1 comes out ahead, 68 to 33 on our weighted score, and it is the cheaper option too.

  1. OpenAI

    GPT-6 Astra (Fast)

    Released Sep 4, 2026New

    33/100
    • ECI—
    • Price$20.00 / $100.00
    • Context1.05M
    Full specs Remove GPT-6 Astra (Fast)
  2. Our pick

    Poolside

    Laguna S 2.1

    Released Jul 21, 2026

    68/100
    • ECI—
    • Price$0.09 / $0.18
    • Context1.05M
    Full specs Remove Laguna S 2.1

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Laguna S 2.1 is our pick

Laguna S 2.1 is the better all-round choice, scoring 68/100 against GPT-6 Astra (Fast) (33). It leads on price. GPT-6 Astra (Fast) wins on inputs & features. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.

  • CapabilityNot enough dataNo independent benchmark covers every model here yet
  • Lowest priceLaguna S 2.1Laguna S 2.1 $0.113 · GPT-6 Astra (Fast) $40.00 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameGPT-6 Astra (Fast) 1,050,000 · Laguna S 2.1 1,048,576 tokens
  • Widest inputsGPT-6 Astra (Fast)GPT-6 Astra (Fast): Text, Images, PDFs · Laguna S 2.1: Text
  • Self-hostingLaguna S 2.1Publishes downloadable weights
How the score is built
MeasureWeightGPT-6 Astra (Fast)Laguna S 2.1
Price50%091
Inputs & features30%7035
Context window20%6161
Overall100%33/10068/100

Left out because at least one model lacks the data: capability. The remaining weights were rescaled.

02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

GPT-6 Astra (Fast) vs Laguna S 2.1 specifications side by side
SpecificationGPT-6 Astra (Fast)OpenAILaguna S 2.1Poolside
Capability
Capabilities Index (ECI)——
ECI rank——
Price per million tokens
Input$20.00$0.09 (best)
Output$100.00$0.18 (best)
Cached input——
Blended (3:1)$40.00$0.113 (best)
Long-context rateSame rateSame rate
Price sourceMedian of 1 providersMedian of 2 providers
Limits
Context window1,050,000 tokens (best)1,048,576 tokens
Max output128,000 tokens (best)32,768 tokens
Inputs and features
TextYesYes
ImagesYesNo
PDFsYesNo
AudioNoNo
VideoNoNo
ReasoningYesYes
Tool callingYesYes
Structured outputNoNo
Availability
WeightsProprietaryOpen
API model ID—poolside/laguna-s-2.1
API providers14 (best)
ReleasedSep 4, 2026Jul 21, 2026
Knowledge cutoff——
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • GPT-6 Astra (Fast)$400.00
  • Laguna S 2.1$1.26
04 — Questions

Which should you choose?

Which is better: GPT-6 Astra (Fast) or Laguna S 2.1?

Laguna S 2.1 is the better all-round choice, scoring 68/100 against GPT-6 Astra (Fast) (33). It leads on price. GPT-6 Astra (Fast) wins on inputs & features. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.

Which is cheaper, GPT-6 Astra (Fast) or Laguna S 2.1?

Laguna S 2.1 is cheaper at $0.09 input / $0.18 output per million tokens (median across 2 API providers; free on Poolside). GPT-6 Astra (Fast) costs $20.00 input / $100.00 output per million tokens (median across 1 API provider). At a typical mix of three input tokens to one output token, that is $0.113 per million tokens for Laguna S 2.1 versus $40.00 for GPT-6 Astra (Fast) (356× as much).

Which scores higher on benchmarks?

There is no independent benchmark that covers both models yet. GPT-6 Astra (Fast) has not been scored yet and Laguna S 2.1 has not been scored yet.

Which is better for coding?

There are no published SWE-bench Verified results for GPT-6 Astra (Fast) and Laguna S 2.1 yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.

Which has the bigger context window?

Their context windows are effectively the same size: GPT-6 Astra (Fast) 1,050,000 and Laguna S 2.1 1,048,576 tokens. Maximum output per response: GPT-6 Astra (Fast) up to 128,000, Laguna S 2.1 up to 32,768 tokens.

Which can read images, PDFs, audio or video?

GPT-6 Astra (Fast) accepts text, images and PDFs; Laguna S 2.1 accepts text. GPT-6 Astra (Fast) handles the widest range of inputs.

Are any of these open source?

Laguna S 2.1 publishes its weights and can be self-hosted; GPT-6 Astra (Fast) is proprietary.

Which is newer?

GPT-6 Astra (Fast) is the newest, released Sep 4, 2026. Laguna S 2.1 came out Jul 21, 2026.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Nov 2, 2026.

05 — Keep comparing

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