Gemini 2.5 Pro vs GPT-5.6 Terra
Benchmark Performance
Available Benchmarks
| Benchmark | Gemini 2.5 Pro | GPT-5.6 Terra |
|---|---|---|
| LMArena Document Arenadocument-2026-07-30-011508720696 · arena_rating · leader | 1,420.8796% of row best · rating · gemini-2.5-pro; 95% CI [1414.58328718, 1427.16017237]; votes 24963; rank 31 | 1,479.21100% of row best · rating · gpt-5.6-terra-xhigh; 95% CI [1466.19331424, 1492.21945897]; votes 1969; rank 10 |
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,457.82100% of row best · rating · gemini-2.5-pro; 95% CI [1455.34940240, 1460.28624287]; votes 122575; rank 33 | 1,446.7299% 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 · statistical tie | 1,262.4299% of row best · rating · gemini-2.5-pro; 95% CI [1257.72056767, 1267.11330698]; votes 87719; rank 41 | 1,268.99100% of row best · rating · gpt-5.6-terra-xhigh; 95% CI [1259.82673197, 1278.15538857]; votes 5774; rank 33 |
| ToneBench2026-08-14-10-task · overall_score · leader | 78.6391% of row best · points · Gemini 2.5 Pro · 4,636 output tokens / case | 86.60100% of row best · points · GPT-5.6 Terra (xhigh) · 4,819 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above · 1 tie | 1 benchmark win | 2 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.
Technical Differences
Side-by-Side Facts
| Field | Gemini 2.5 Pro | GPT-5.6 Terra |
|---|---|---|
| Developer | Google DeepMind | OpenAI |
| Family | Gemini 2 5 | Gpt 5 6 |
| Model | Gemini 2.5 Pro | GPT-5.6 Terra |
| Version | Gemini 2.5 Pro | GPT-5.6 Terra |
| Lifecycle | active | active |
| Released | Unknown | Unknown |
| Knowledge cutoff | 2025-01-01 | 2026-02-16 |
| Input modalities | Text, Image, Video, Audio, Document | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,048,576 | 1,050,000 |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Google AI (Standard) | OpenAI (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, tools |
14 comparable fields · 8 material differences · Pair passes the primary-source comparison gate
Gemini 2.5 Pro Capabilities
GPT-5.6 Terra Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
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GPT-4.1 MiniOpenAI | vs | GPT-5.6 TerraOpenAI | family variantsimage, text |
Claude Fable 5Anthropic | vs | GPT-5.6 TerraOpenAI | cross-developer peersimage, text |
Claude Mythos 5.1Anthropic | vs | GPT-5.6 TerraOpenAI | cross-developer peersimage, text |
 Nova 2 LiteAmazon | vs | Gemini 2.5 ProGoogle DeepMind | cross-developer peerstext |
Gemini 2.5 ProGoogle DeepMind | vs |  Qwen3.8-FlashQwen | cross-developer peerstext |
Gemini Computer UseGoogle DeepMind | vs | Gemini 2.5 ProGoogle DeepMind | family variantstext |
Gemini Deep ResearchGoogle DeepMind | vs | Gemini 2.5 ProGoogle DeepMind | family variantstext |
Gemini Deep Research MaxGoogle DeepMind | vs | Gemini 2.5 ProGoogle DeepMind | family variantstext |
Gemini 2.5 FlashGoogle DeepMind | vs | GPT-5.6 TerraOpenAI | cross-developer peerstext |
Gemini 2.5 Flash-LiteGoogle DeepMind | vs | GPT-5.6 TerraOpenAI | cross-developer peerstext |
Primary Evidence
Sources and Freshness
Questions
Gemini 2.5 Pro vs GPT-5.6 Terra FAQs
Is Gemini 2.5 Pro or GPT-5.6 Terra better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Gemini 2.5 Pro and GPT-5.6 Terra, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Gemini 2.5 Pro or GPT-5.6 Terra?+
Gemini 2.5 Pro is $1.25 and GPT-5.6 Terra is $2.00 per million tokens, so Gemini 2.5 Pro is cheaper on this metric. Gemini 2.5 Pro is $10.00 and GPT-5.6 Terra is $12.00 per million tokens, so Gemini 2.5 Pro is cheaper on this metric.
Which has a larger context window, Gemini 2.5 Pro or GPT-5.6 Terra?+
GPT-5.6 Terra has the larger sourced context window. Gemini 2.5 Pro supports 1,048,576 and GPT-5.6 Terra supports 1,050,000.
Which performs better in benchmarks, Gemini 2.5 Pro or GPT-5.6 Terra?+
GPT-5.6 Terra leads the current overall benchmark count. The result uses 4 protocol-matched benchmarks from 2 publishers; it is not a universal quality score.
Can Gemini 2.5 Pro or GPT-5.6 Terra be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Gemini 2.5 Pro is not marked open weight; GPT-5.6 Terra is not marked open weight.
Can Gemini 2.5 Pro and GPT-5.6 Terra understand images?+
Gemini 2.5 Pro is documented with image input; GPT-5.6 Terra is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Gemini 2.5 Pro or GPT-5.6 Terra?+
GPT-5.6 Terra has the larger sourced maximum output: Gemini 2.5 Pro supports 65,536 and GPT-5.6 Terra supports 128,000 output tokens.
Do Gemini 2.5 Pro and GPT-5.6 Terra support reasoning and tool use?+
Gemini 2.5 Pro: reasoning, tool calling, and image input. GPT-5.6 Terra: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Gemini 2.5 Pro or GPT-5.6 Terra?+
Gemini 2.5 Pro has 1 sourced provider route; GPT-5.6 Terra has 2, so GPT-5.6 Terra has broader tracked availability.
Which offers better value, Gemini 2.5 Pro 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.