GPT-5.4 nano vs Laguna S 2.1
Laguna S 2.1 comes out ahead, 69 to 63 on our weighted score, and it is the cheaper option too.
OpenAIGPT-5.4 nano
63/100- ECI145.8
- Price$0.20 / $1.25
- Context400K
- Our pick
PoolsideLaguna S 2.1
69/100- ECI—
- Price$0.10 / $0.20
- Context1.05M
Add a model
Make it a three-way comparison.
Laguna S 2.1 is our pick
Laguna S 2.1 is the better all-round choice, scoring 69/100 against GPT-5.4 nano (63). It leads on price and context window. GPT-5.4 nano 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 $0.125 · GPT-5.4 nano $0.463 per 1M tokens (3:1 blend)
- Longest contextLaguna S 2.1Laguna S 2.1 1,048,576 · GPT-5.4 nano 400,000 tokens
- Widest inputsGPT-5.4 nanoGPT-5.4 nano: Text, Images · Laguna S 2.1: Text
- Self-hostingLaguna S 2.1Publishes downloadable weights
| Measure | Weight | GPT-5.4 nano | Laguna S 2.1 |
|---|---|---|---|
| Price | 50% | 66 | 93 |
| Inputs & features | 30% | 70 | 35 |
| Context window | 20% | 44 | 61 |
| Overall | 100% | 63/100 | 69/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-5.4 nanoOpenAI | Laguna S 2.1Poolside |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | 145.8 | — |
| ECI rank | #75 of 148 | — |
| GPQA DiamondGraduate-level science questions | 78.5% | — |
| FrontierMath Tiers 1–3Research-level mathematics | 44.9% | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 87.8% | — |
| SimpleQA VerifiedShort factual questions | 11.7% | — |
| Price per million tokens | ||
| Input | $0.20 | $0.10 (best) |
| Output | $1.25 | $0.20 (best) |
| Cached input | $0.02 | — |
| Blended (3:1) | $0.463 | $0.125 (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Official OpenAI API | Median of 4 providers |
| Limits | ||
| Context window | 400,000 tokens | 1,048,576 tokens (best) |
| Max output | 128,000 tokens (best) | 32,768 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | No |
| PDFs | No | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yeslow · medium · high · xhigh | Yes |
| Tool calling | Yes | Yes |
| Structured output | Yes | No |
| Availability | ||
| Weights | Proprietary | Open |
| API model ID | gpt-5.4-nano | poolside/laguna-s-2.1 |
| API providers | 26 (best) | 6 |
| Released | Mar 17, 2026 | Jul 21, 2026 |
| Knowledge cutoff | Aug 31, 2025 | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GPT-5.4 nano$4.50
- Laguna S 2.1$1.40
Which should you choose?
Which is better: GPT-5.4 nano or Laguna S 2.1?
Laguna S 2.1 is the better all-round choice, scoring 69/100 against GPT-5.4 nano (63). It leads on price and context window. GPT-5.4 nano 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-5.4 nano or Laguna S 2.1?
Laguna S 2.1 is cheaper at $0.10 input / $0.20 output per million tokens (median across 4 API providers; free on Poolside). GPT-5.4 nano costs $0.20 input / $1.25 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $0.125 per million tokens for Laguna S 2.1 versus $0.463 for GPT-5.4 nano (3.7× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. GPT-5.4 nano has an ECI of 145.8 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-5.4 nano 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?
Laguna S 2.1 has the largest context window at 1,048,576 tokens, against 400,000 for GPT-5.4 nano. Maximum output per response: GPT-5.4 nano up to 128,000, Laguna S 2.1 up to 32,768 tokens.
Which can read images, PDFs, audio or video?
GPT-5.4 nano accepts text and images; Laguna S 2.1 accepts text. GPT-5.4 nano 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-5.4 nano is proprietary.
Which is newer?
Laguna S 2.1 is the newest, released Jul 21, 2026. GPT-5.4 nano came out Mar 17, 2026. Knowledge cutoff: GPT-5.4 nano Aug 31, 2025.
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 Oct 4, 2026.
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