Long documents
Prompts that approach the documented context limit
Gemini 3 Pro
Gemini 3 Pro has the larger documented context window.
Confidence: documented
Gemini 3 Pro vs GPT-5.6 Terra
Updated September 24, 2026. Rank says GPT-5.6 Terra is ahead. Price, access, and your workload can each overturn that. Public scores include evidence status and uncertainty.
Both of these models will change. Get the price, version and retirement notices for the pair, each with its source. Follow model changes
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Decision reading
GPT-5.6 Terra has the higher public score estimate, 72.58 versus 61.01, but the 90% score intervals overlap. Treat that as a lead, not a settled winner. 4 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.
- Shared results
- 4
- Gemini 3 Pro only
- 8
- GPT-5.6 Terra only
- 28
- Like-for-like categories
- 0 / 8
Supported: Gemini 3 Pro and GPT-5.6 TerraHow the comparison works
Which one for your work
Recommendations appear only when a shared evidence basis or an explicit operating constraint supports the call. Secondary and unsupported use cases stay disclosed below the initial list.
Cache-heavy agent loop cost
200K cached + 20K fresh input + 10K output tokens
GPT-5.6 Terra
GPT-5.6 Terra has the lower estimated token cost for this stated workload. Gemini 3 Pro has no published cached-input rate, so cached tokens use its listed input rate.
Confidence: rate-fallback
Show secondary and unsupported calls
Coding work
Code generation, repair, and software-engineering tasks
Not enough matched evidence
Gemini 3 Pro is scored on Estimated evidence for coding, so the reading is directional rather than like-for-like.
Confidence: limitedAgentic work
Tool use, computer use, and multi-step task completion
Not enough matched evidence
Gemini 3 Pro is not ranked on the public lane for agentic, so no winner is named for agentic.
Confidence: limitedChat turn cost
1K fresh input + 500 output tokens
No clear pick
A complete comparable API-rate estimate is not available for both models.
Confidence: listed-ratesRepository review cost
50K fresh input + 3K output tokens
No clear pick
A complete comparable API-rate estimate is not available for both models.
Confidence: listed-rates
Which one for a specific job
Choose a job from the LLM Selector's task catalog to see the category row it rests on, under the same basis rules as the table below. A directional row stays directional; choosing a job never creates a winner.
The same task catalog as the LLM Selector. Each job names the evidence surface it rests on; nothing here adds a new score.
45.1Gemini 3 Pro64.7GPT-5.6 Terra
Directional only · BenchAlign v5.7
GPT-5.6 Terra scores higher, but at least one score rests on Estimated evidence or a different benchmark set. Directional only, no winner.
Coding scores combine specific tasks and setups. Match the editor, harness, and effort to your workflow.
Same basis rules as the category table below
What is actually comparable
Shared results can support a head-to-head reading. Results present for only one model describe coverage, not superiority.
8 Gemini 3 Pro only
4 Shared
28 GPT-5.6 Terra only
4 categories rest on Estimated evidence or different evidence sets. Those rows remain visible for coverage context but do not name a winner.
Shape of the matched evidence
Only shared public evidence is shown. Sparse evidence stays a ruled list rather than being closed into a radar shape.
Too few matched category axes support a radar. The ruled list below shows only shared benchmark results; positions use each benchmark’s normalized display scale when available.
ARC-AGI-2Reasoning
Normalized gap 52.8Gemini 3 Pro:31.1%GPT-5.6 Terra:83.9%FrontierMath v2 (Tier 4)Math
Normalized gap 49.5Gemini 3 Pro:18.750%GPT-5.6 Terra:68.300%FrontierMath v2 (Tiers 1-3)Math
Normalized gap 47.3Gemini 3 Pro:37.600%GPT-5.6 Terra:84.900%MMMU-ProMultimodal
Normalized gap 0.3Gemini 3 Pro:81%GPT-5.6 Terra:80.7%
Bars run 0–100 on each benchmark’s normalized display scale
Category results, on a stated basis
Each row shows the public-lane category score for both models: the BenchAlign v5.7 lane for agentic, coding, and knowledge, and the weighted public rows elsewhere, with the same rank each model page reports. A row is like-for-like only when both scores rest on Supported evidence or the same weighted set. Directional and not-comparable rows remain visible, but they never receive a winner.
Coding
Directional only- Gemini 3 Pro
- 45.1
- Estimated · #47/135
- GPT-5.6 Terra
- 64.7
- Supported · #8/135
- Basis
- BenchAlign v5.7 lane · 1 vs 8 public rows
- Reading
- Directional only
Multimodal
Directional only- Gemini 3 Pro
- 74.2
- #18/50
- GPT-5.6 Terra
- 77.2
- #16/50
- Basis
- Provisional lane · 2 vs 1 weighted rows
- Reading
- Directional only
Knowledge
Directional only- Gemini 3 Pro
- 59.0
- Estimated · #36/158
- GPT-5.6 Terra
- 71.1
- Supported · #9/158
- Basis
- BenchAlign v5.7 lane · 0 vs 8 public rows
- Reading
- Directional only
Instruction following
Directional only- Gemini 3 Pro
- 84.7
- #39/124
- GPT-5.6 Terra
- 85.7
- #35/124
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Directional only
Agentic
Not comparable- Gemini 3 Pro
- Not ranked
- GPT-5.6 Terra
- 59.5
- Supported · #18/105
- Basis
- BenchAlign v5.7 lane · 2 vs 9 public rows
- Reading
- Not comparable
Reasoning
Not comparable- Gemini 3 Pro
- 46.4
- Unranked · 3 rankable rows
- GPT-5.6 Terra
- 65.4
- #12/19
- Basis
- Provisional lane · 1 vs 2 weighted rows
- Reading
- Not comparable
Multilingual
Not comparable- Gemini 3 Pro
- Not ranked
- GPT-5.6 Terra
- Not ranked
- Basis
- Provisional lane · 0 vs 0 weighted rows
- Reading
- Not comparable
Math
Not comparable- Gemini 3 Pro
- 55.2
- Unranked · 2 rankable rows
- GPT-5.6 Terra
- 96.8
- Unranked · 3 rankable rows
- Basis
- Provisional lane · 2 vs 2 weighted rows
- Reading
- Not comparable
| Category | Gemini 3 Pro | GPT-5.6 Terra | Basis | Reading |
|---|---|---|---|---|
| Coding | 45.1Estimated · #47/135 | 64.7Supported · #8/135 | Directional onlyBenchAlign v5.7 lane · 1 vs 8 public rows | Directional only |
| Multimodal | 74.2#18/50 | 77.2#16/50 | Directional onlyProvisional lane · 2 vs 1 weighted rows | Directional only |
| Knowledge | 59.0Estimated · #36/158 | 71.1Supported · #9/158 | Directional onlyBenchAlign v5.7 lane · 0 vs 8 public rows | Directional only |
| Instruction following | 84.7#39/124 | 85.7#35/124 | Directional onlyProvisional lane · 0 vs 0 weighted rows | Directional only |
| Agentic | Not ranked | 59.5Supported · #18/105 | Not comparableBenchAlign v5.7 lane · 2 vs 9 public rows | Not comparable |
| Reasoning | 46.4Unranked · 3 rankable rows | 65.4#12/19 | Not comparableProvisional lane · 1 vs 2 weighted rows | Not comparable |
| Multilingual | Not ranked | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Math | 55.2Unranked · 2 rankable rows | 96.8Unranked · 3 rankable rows | Not comparableProvisional lane · 2 vs 2 weighted rows | Not comparable |
Ranks count the models scored in each category’s lane, so the agentic, coding, and knowledge denominators (BenchAlign v5.7) differ from the provisional-lane categories. Unranked scores sit on the provisional lane’s scale but never name a winner. Like-for-like rows within 0.5 points read as a practical tie.
Supported evidence per lane · bars run 0–100Methodology
What each workload costs
Three fixed token mixes turn per-token rates into comparable decisions. Each scenario states context fit and whether cached input had to fall back to the published list-input rate.
Chat turn
1K fresh input + 500 output tokens
- Gemini 3 Pro
- $0.008
- Fits in one request
- GPT-5.6 Terra
- $0.008
- Fits in one request
Modeled costs are equal
Costs use the listed standard API rates.
Repository review
50K fresh input + 3K output tokens
- Gemini 3 Pro
- $0.136
- Fits in one request
- GPT-5.6 Terra
- $0.136
- Fits in one request
Modeled costs are equal
Costs use the listed standard API rates.
Cache-heavy agent loop
200K cached + 20K fresh input + 10K output tokens
- Gemini 3 Pro
- $0.56
- Fits in one request
- Cached input priced at the published list-input rate
- GPT-5.6 Terra
- $0.2
- Fits in one request
GPT-5.6 Terra has the lower modeled cost
Gemini 3 Pro has no published cached-input rate, so cached tokens use its listed input rate.
Cached input falls back to the list input rate only where a cached rate is unpublished
Specification differences
Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.
SpecificationGemini 3 ProGPT-5.6 Terra
Context window
Maximum documented context; output-token limits may be lower.
Gemini 3 Pro
2M
GPT-5.6 Terra
1.05M
OpenAI model catalogAPI model ID
Gemini 3 Pro
Not sourced
GPT-5.6 Terra
gpt-5.6-terra
OpenAI model catalogCached-input rate
A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.
Gemini 3 Pro
Not published
GPT-5.6 Terra
$0.2 per 1M cached input tokens
OpenAI pricingDocumented inputs
Gemini 3 Pro
Not sourced
GPT-5.6 Terra
text, image
OpenAI model catalogDocumented outputs
Gemini 3 Pro
Not sourced
GPT-5.6 Terra
Provider availability
Gemini 3 Pro
Not sourced
GPT-5.6 Terra
Generally Available · OpenAI Responses API
OpenAI model catalogReasoning profile
Gemini 3 Pro
Non-Reasoning
GPT-5.6 Terra
Reasoning
Weight access
Gemini 3 Pro
Proprietary
GPT-5.6 Terra
Proprietary
License
Gemini 3 Pro
Proprietary
GPT-5.6 Terra
Proprietary
Release date
Gemini 3 Pro
2025-11-18
GPT-5.6 Terra
2026-07-09
If you already use one of these models
- Deployment change
- The models list different providers, so authentication, endpoint behavior, limits, and feature support may change.
- Quality signal
- GPT-5.6 Terra has the higher public score estimate, 72.58 versus 61.01, but the 90% score intervals overlap.
- Workload cost
- Repository review: $0.136 vs $0.136. Cache-heavy agent loop: $0.56 vs $0.2.
- Context tradeoff
- Gemini 3 Pro has the larger documented window (2M).
Run the same representative tasks against both endpoints before changing production traffic.
Questions
Which is better, Gemini 3 Pro or GPT-5.6 Terra?
GPT-5.6 Terra has the higher public score estimate, 72.58 versus 61.01, but the 90% score intervals overlap. The higher estimate is not a decisive winner because the uncertainty ranges overlap.
Which is better for coding, Gemini 3 Pro or GPT-5.6 Terra?
GPT-5.6 Terra scores higher for coding on the public lane, 64.7 to 45.1. Gemini 3 Pro is scored on Estimated evidence for coding, so the reading is directional rather than like-for-like. BenchLM does not name a winner for coding from a directional reading; read the shared benchmark rows directly and test the models on the same task set.
Which is better for agentic tasks, Gemini 3 Pro or GPT-5.6 Terra?
Gemini 3 Pro is not ranked on the public lane for agentic tasks, so no winner is named for agentic tasks.
Which costs less, Gemini 3 Pro or GPT-5.6 Terra?
For the stated presets, chat costs $0.008 on Gemini 3 Pro and $0.008 on GPT-5.6 Terra; repository review costs $0.136 and $0.136; the cache-heavy agent loop costs $0.56 and $0.2. Gemini 3 Pro has no published cached-input rate, so cached tokens use its listed input rate.
Which has the larger context window, Gemini 3 Pro or GPT-5.6 Terra?
Gemini 3 Pro has the larger documented context window: 2M, compared with 1.05M.
Benchmark evidence
The full public result ledger is available for audit without forcing a wide desktop table onto a phone.
Browse raw public benchmark evidence40 rows
Agentic
Gert Labs
Gemini 3 Pro63.23%SourceGPT-5.6 Terra—Not directly comparable
JobBench
Gemini 3 Pro11.4%SourceGPT-5.6 Terra—Not directly comparable
Terminal-Bench 3.0
Gemini 3 Pro—GPT-5.6 Terra20.8%SourceNot directly comparable
Terminal-Bench 2.1
Gemini 3 Pro—GPT-5.6 Terra87.4%SourceNot directly comparable
BrowseComp
Gemini 3 Pro—GPT-5.6 Terra87.5%SourceNot directly comparable
OSWorld 2.0
Gemini 3 Pro—GPT-5.6 Terra50.2%SourceNot directly comparable
CyberGym
Gemini 3 Pro—GPT-5.6 Terra81.8%SourceNot directly comparable
ExploitGym
Gemini 3 Pro—GPT-5.6 Terra23.2%SourceNot directly comparable
Toolathlon
Gemini 3 Pro—GPT-5.6 Terra53.1%SourceNot directly comparable
Terminal-Bench 2.1 (Vals)
Gemini 3 Pro—GPT-5.6 Terra77.5%SourceNot directly comparable
ApprenticeBench
Gemini 3 Pro—GPT-5.6 Terra16%SourceNot directly comparable
Coding
Vibe Code Bench
Gemini 3 Pro14.30%SourceGPT-5.6 Terra—Not directly comparable
SWE-bench Pro
Gemini 3 Pro—GPT-5.6 Terra63.4%SourceNot directly comparable
Terminal-Bench 2.1
Gemini 3 Pro—GPT-5.6 Terra87.4%SourceNot directly comparable
DeepSWE
Gemini 3 Pro—GPT-5.6 Terra69.6%SourceNot directly comparable
FrontierCode 1.1 Extended
Gemini 3 Pro—GPT-5.6 Terra55.8%SourceNot directly comparable
cursorBench32
Gemini 3 Pro—GPT-5.6 Terra64.9%SourceNot directly comparable
VulcanBench v3
Gemini 3 Pro—GPT-5.6 Terra87.0%SourceNot directly comparable
LiveCodeBench (Vals)
Gemini 3 Pro—GPT-5.6 Terra85.9%SourceNot directly comparable
SWE-bench (Vals)
Gemini 3 Pro—GPT-5.6 Terra95.4%SourceNot directly comparable
Reasoning
Multimodal
MMMU-Pro
Gemini 3 Pro81%SourceGPT-5.6 Terra80.7%SourceGemini 3 Pro leads this result
MathVision
Gemini 3 Pro86.6%SourceGPT-5.6 Terra—Not directly comparable
VideoMMMU
Gemini 3 Pro87.6%SourceGPT-5.6 Terra—Not directly comparable
ScreenSpot Pro
Gemini 3 Pro72.7%SourceGPT-5.6 Terra—Not directly comparable
CharXiv
Gemini 3 Pro81.4%SourceGPT-5.6 Terra—Not directly comparable
V*
Gemini 3 Pro88.0%SourceGPT-5.6 Terra—Not directly comparable
MMMU-Pro w/ Python
Gemini 3 Pro—GPT-5.6 Terra82%SourceNot directly comparable
Knowledge
GPQA
Gemini 3 Pro—GPT-5.6 Terra92.9%SourceNot directly comparable
GPQA-D
Gemini 3 Pro—GPT-5.6 Terra92.9%SourceNot directly comparable
HLE-Verified
Gemini 3 Pro—GPT-5.6 Terra51.1%SourceNot directly comparable
LABBench2
Gemini 3 Pro—GPT-5.6 Terra81.2%SourceNot directly comparable
HealthBench Professional
Gemini 3 Pro—GPT-5.6 Terra57.7%SourceNot directly comparable
HealthBench Hard
Gemini 3 Pro—GPT-5.6 Terra32.7%SourceNot directly comparable
GPQA Diamond (Vals)
Gemini 3 Pro—GPT-5.6 Terra90.9%SourceNot directly comparable
MMLU-Pro (Vals)
Gemini 3 Pro—GPT-5.6 Terra86.7%SourceNot directly comparable
Math
FrontierMath v2 (Tiers 1-3)
Gemini 3 Pro37.600%SourceGPT-5.6 Terra84.900%SourceGPT-5.6 Terra leads this result
FrontierMath v2 (Tier 4)
Gemini 3 Pro18.750%SourceGPT-5.6 Terra68.300%SourceGPT-5.6 Terra leads this result
FrontierMath (legacy)
Gemini 3 Pro—GPT-5.6 Terra84.9%SourceNot directly comparable
40 public results · 4 shared
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Last updated September 24, 2026