GPT-5 Nano vs GPT-5.6 Terra

Benchmark Performance

Available Benchmarks

BenchmarkGPT-5 NanoGPT-5.6 Terra
ARC-AGI-1verified-v1-15fb467fd4fc · verified_score · leader20.7121% of row best · percent · GPT-5 Nano (Medium)96.50100% of row best · percent · GPT-5.6 Terra (Max)
ARC-AGI-2verified-v2-9a3db289984e · verified_score · leader2.613% of row best · percent · GPT-5 Nano (High)83.90100% of row best · percent · GPT-5.6 Terra (Max)
LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader1,319.8491% of row best · rating · gpt-5-nano-high; 95% CI [1312.99438214, 1326.68844296]; votes 8128; rank 2141,446.72100% of row best · rating · gpt-5.6-terra-xhigh; 95% CI [1441.68248185, 1451.74987487]; votes 23942; rank 47
LMArena Vision Arenavision-2026-08-27-011508720696 · arena_rating · leader1,159.2491% of row best · rating · gpt-5-nano-high; 95% CI [1148.19623356, 1170.28699037]; votes 3950; rank 961,268.99100% of row best · rating · gpt-5.6-terra-xhigh; 95% CI [1259.82673197, 1278.15538857]; votes 5774; rank 33
ToneBench2026-08-28-10-task-cd9819ab6e4d · overall_score · leader61.6272% of row best · points · GPT-5 nano · 7,465 output tokens / case85.70100% of row best · points · GPT-5.6 Terra (low) · 2,921 output tokens / case
Overall ResultCounted from the protocol-matched rows above0 benchmark wins5 benchmark winsOverall lead

Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.

FieldAt a Glance
Openai · activeGPT-5 NanoVerified Sep 3, 2026
Openai · activeGPT-5.6 TerraVerified Aug 28, 2026
Not a Valid ComparisonThese records do not share a sourced modality and workload.

Technical Differences

Side-by-Side Facts

Interactive only
FieldGPT-5 NanoGPT-5.6 Terra
DeveloperOpenaiOpenai
FamilyGpt 5Gpt 5 6
ModelGPT-5 NanoGPT-5.6 Terra
VersionGPT-5 NanoGPT-5.6 Terra
Lifecycleactiveactive
Released2025-08-07Unknown
Knowledge cutoff2024-05-312026-02-16
Input modalitiesUnknownUnknown
Output modalitiesUnknownUnknown
Context window400,0001,050,000
Total parametersUnknownUnknown
Active parametersUnknownUnknown
LicenseUnknownUnknown
Open weightsNoNo
API availableYesYes
Self-hostableNoNo
Provider accessOpenai (Standard), Openrouter (Standard)Openai (Standard), Openrouter (Standard)
Capabilitieschat, generation, reasoning, structured_outputs, toolschat, generation, reasoning, tools

12 comparable fields · 6 material differences · Interactive comparison only; indexing gate not met

GPT-5 Nano Capabilities

chatgenerationreasoningstructured outputstools
Input price$0.025
Output price$0.20
Serving providers2
Canonical IDopenai/gpt-5-nano

GPT-5.6 Terra Capabilities

chatgenerationreasoningtools
Input price$2.00
Output price$12.00
Serving providers2
Canonical IDopenai/gpt-5.6-terra

Primary Evidence

Sources and Freshness

Questions

GPT-5 Nano vs GPT-5.6 Terra FAQs

Is GPT-5 Nano or GPT-5.6 Terra better for coding?+

This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5 Nano and GPT-5.6 Terra, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.

Which is cheaper, GPT-5 Nano or GPT-5.6 Terra?+

GPT-5 Nano is $0.025 and GPT-5.6 Terra is $2.00 per million tokens, so GPT-5 Nano is cheaper on this metric. GPT-5 Nano is $0.20 and GPT-5.6 Terra is $12.00 per million tokens, so GPT-5 Nano is cheaper on this metric.

Which has a larger context window, GPT-5 Nano or GPT-5.6 Terra?+

GPT-5.6 Terra has the larger sourced context window. GPT-5 Nano supports 400,000 and GPT-5.6 Terra supports 1,050,000.

Which performs better in benchmarks, GPT-5 Nano or GPT-5.6 Terra?+

GPT-5.6 Terra leads the current overall benchmark count. The result uses 5 protocol-matched benchmarks from 3 publishers; it is not a universal quality score.

Can GPT-5 Nano or GPT-5.6 Terra be self-hosted?+

Both models have the same recorded self-hosting status: unsupported. GPT-5 Nano is not marked open weight; GPT-5.6 Terra is not marked open weight.

Can GPT-5 Nano and GPT-5.6 Terra understand images?+

GPT-5 Nano is not documented with image input; GPT-5.6 Terra is not documented with image input. This reflects supported input modalities, not vision quality.

Which can generate longer answers, GPT-5 Nano or GPT-5.6 Terra?+

Neither has a larger sourced maximum output. GPT-5 Nano is 128,000 and GPT-5.6 Terra is 128,000.

Do GPT-5 Nano and GPT-5.6 Terra support reasoning and tool use?+

GPT-5 Nano: reasoning and tool calling. GPT-5.6 Terra: reasoning and tool calling. Feature support does not establish relative quality.

Which is available from more inference providers, GPT-5 Nano or GPT-5.6 Terra?+

GPT-5 Nano has 2 sourced provider routes; GPT-5.6 Terra has 2, a tie.

Which offers better value, GPT-5 Nano or GPT-5.6 Terra?+

There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.

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