Skip to content
ModelCap

Head-to-head comparison

Nex-N2.5-Mini vs GPT-5.6 Terra

Nex-N2.5-Mini (Nex AGI) and GPT-5.6 Terra (OpenAI) 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 9 September 2026

As of 9 September 2026, GPT-5.6 Terra holds the stronger ModelCap Index position (#15 vs #22); Nex-N2.5-Mini is cheaper per output token (Free/1M vs $12.00/1M); GPT-5.6 Terra offers the longer context window (1M vs 262K tokens); and Nex-N2.5-Mini ships open weights.

Which should you choose?

Choose Nex-N2.5-Mini if…

  • API cost matters — Free/1M output tokens against $12.00/1M.
  • your workload is prompt-heavy — input tokens cost Free/1M against $2.00/1M.
  • you want to self-host: Nex-N2.5-Mini ships open weights while GPT-5.6 Terra is api only.
  • you want the more recently listed model — Nex-N2.5-Mini was listed 8 September 2026, GPT-5.6 Terra 9 July 2026.

Choose GPT-5.6 Terra if…

  • you want the stronger overall ModelCap Index position — #15 against #22 (76.1 vs 72.2 points).
  • you need the longer context window — 1M tokens against 262K.
  • you want provider choice — 3 listed API providers against 1.

Nex-N2.5-Mini vs GPT-5.6 Terra: specs, pricing and context

Specification comparison of Nex-N2.5-Mini and GPT-5.6 Terra
FieldNex-N2.5-MiniNex AGIGPT-5.6 TerraOpenAI
ModelCap Index position#22#15
Index score72.276.1
EvidenceEstimatedMeasured
Input price / 1M tokensFree$2.00
Output price / 1M tokensFree$12.00
Context window262K tokens1M tokens
Max output tokens236K128K
API providers listed13
Weight accessOpen weightsAPI only
Input modalitiesText, ImageFile, Image, Text
First listed8 September 20269 July 2026
PublisherNex AGIOpenAI

Evidence: global-corpus-prior over 182 held-out anchors (7%); launch card against 7 resolved peers on 8 rows (93%); optimism haircut 0 from cross-lab-probe; shrunk 1.4 toward the measured corpus · 6 public benchmark observations across 6 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Nex-N2.5-Mini vs GPT-5.6 Terra

Public benchmark boards where Nex-N2.5-Mini or GPT-5.6 Terra has a published result
BoardNex-N2.5-MiniGPT-5.6 TerraLeads
Arena codingArena (LMArena)—15191511–1527X-HighOnly one result
LMArena AgentLMArena—1.5%0.3%–2.7%X-HighOnly one result
ARC-AGI-2ARC Prize Foundation—83.9%MaxOnly one result
ARC-AGI-3ARC Prize Foundation—0.8%MaxOnly one result
AA Intelligence IndexArtificial Analysis—42.3intelligence-index:v4.3:maxOnly one result
AA Terminal-Bench 2.1Artificial Analysis—88.0%terminal-bench:2.1:terminus-2:e2b:pass-at-1:3-repeats:source-model="GPT-5.6 Terra (max)":reasoning=trueOnly one result
AA τ²-Bench TelecomArtificial Analysis—86.3%tau2:telecom:dual-control:pass-at-1:3-repeats:source-model="GPT-5.6 Terra (max)":reasoning=trueOnly one result
AA Humanity's Last ExamArtificial Analysis—42.9%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="GPT-5.6 Terra (max)":reasoning=trueOnly one result
Terminal-Bench 4.0Terminal-Bench (Laude Institute)—21.5%18.3%–24.8%Codex · MaxOnly 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.

Nex-N2.5-Mini vs GPT-5.6 Terra: common questions

Is Nex-N2.5-Mini better than GPT-5.6 Terra?

GPT-5.6 Terra ranks higher on the ModelCap Index as of 9 September 2026: #15 against #22. 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. Their published uncertainty intervals overlap, so the rank difference alone does not establish a reliable capability advantage for your workload.

Is Nex-N2.5-Mini cheaper than GPT-5.6 Terra?

Nex-N2.5-Mini is cheaper on output tokens: Free/1M against $12.00/1M. Input tokens are Free/1M for Nex-N2.5-Mini and $2.00/1M for GPT-5.6 Terra. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens. For 1,000 requests with 2,000 input and 500 output tokens each (2M input + 0.5M output), the listed-rate estimate is $0 for Nex-N2.5-Mini versus $10.00 for GPT-5.6 Terra. Nex-N2.5-Mini costs 100.0% less in this scenario. This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the selected endpoint before budgeting.

Which has the bigger context window, Nex-N2.5-Mini or GPT-5.6 Terra?

GPT-5.6 Terra has the larger context window: 1M tokens against 262K.

Which is better for coding, Nex-N2.5-Mini or GPT-5.6 Terra?

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 Nex-N2.5-Mini and GPT-5.6 Terra open-weight models?

Nex-N2.5-Mini: Open weights. GPT-5.6 Terra: 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 Nex-N2.5-Mini and GPT-5.6 Terra?

ModelCap currently lists 1 API provider for Nex-N2.5-Mini and 3 for GPT-5.6 Terra, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Nex-N2.5-Mini vs GPT-5.6 Terra comparison?

Every figure comes from the sealed ModelCap dataset published 9 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.

Explore further