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Claude Sonnet 5 vs GPT-5.6 Terra

GPT-5.6 Terra leads Claude Sonnet 5 on coding, 63.9 to 57.7 on the Vibe Coding Index, and Claude Sonnet 5 costs 1.2x less per output token ($10.00 vs $12.00 per million). Updated October 22, 2026; 118 benchmarks have a result for both.

Replace Claude Sonnet 5 Replace GPT-5.6 Terra
Claude Sonnet 5Anthropic
Coding
57.7
Overall
63.2
Output $/M
$10.00
46
GPT-5.6 TerraOpenAI
Coding
63.9
Overall
68.1
Output $/M
$12.00
71
vs boards won of 118 shared, 1 tied

Claude Sonnet 5 or GPT-5.6 Terra: which to pick

Pick GPT-5.6 Terra for coding: it scores 63.9 on the Vibe Coding Index against 57.7 for Claude Sonnet 5.

Pick Claude Sonnet 5 for output tokens 1.2x cheaper ($10.00 vs $12.00 per million) and work measured by LMArena WebDev or Vibe Code Bench (Vals AI), where it leads.

Model AClaude Sonnet 5Anthropic57.7/1006 independent benchmarks$1.87 per solved taskModel BGPT-5.6 TerraOpenAI63.9/1006 independent benchmarks$0.42 per solved task
Shared results
118
Claude Sonnet 5 only
3
GPT-5.6 Terra only
9
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Claude Sonnet 5 57.7 from 6 benchmarks, GPT-5.6 Terra 63.9 from 6 benchmarks.
Widest category
Math, 11.8 points apart on average over 6 shared benchmarks.
Widest single gap
IOI (Vals AI): Claude Sonnet 5 45.0% against GPT-5.6 Terra 87.6%, 42.6 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 5 $10.00 against GPT-5.6 Terra $12.00 per million output tokens, 1.2x apart.
Context window
Claude Sonnet 5 takes 1M tokens, GPT-5.6 Terra 1.05M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryClaude Sonnet 5BarsGPT-5.6 TerraTies
Coding519
Intelligence02
Agentic work118
Reasoning1121 tie
Math33
Knowledge65
Web design81
General1221
All shared boards46711 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index519
Coding benchmarks for Claude Sonnet 5 and GPT-5.6 Terra
BenchmarkClaude Sonnet 5GPT-5.6 TerraLeader
LiveBench coding74.7%86.2%GPT-5.6 Terra
LMArena WebDev15401522Claude Sonnet 5
AA Coding Index71.576.7GPT-5.6 Terra
LiveCodeBench (Vals AI)82.4%85.9%GPT-5.6 Terra
SWE-bench Verified (Vals AI)79.6%95.4%GPT-5.6 Terra
Terminal-Bench 4 (Vals AI)10.6%22.7%GPT-5.6 Terra
Vibe Code Bench (Vals AI)81.3%74.6%Claude Sonnet 5
Code migration (Vals AI)44.4%47.8%GPT-5.6 Terra
ProgramBench (Vals AI)0.0%0.5%GPT-5.6 Terra
IOI (Vals AI)45.0%87.6%GPT-5.6 Terra
Terminal-Bench 2.1 (Vals AI)74.5%77.5%GPT-5.6 Terra
Vibe Code Bench 1-100 (Vals AI)13.8%14.8%GPT-5.6 Terra
SkillsBench (Vals AI)46.5%58.9%GPT-5.6 Terra
CyberBench (Vals AI)70.3%72.1%GPT-5.6 Terra
SciCode54.3%55.0%GPT-5.6 Terra
Terminal-Bench Hard (Artificial Analysis run)Not measured62.9%Only GPT-5.6 Terra measured
FrontierCode42.7%41.3%Claude Sonnet 5
GSO-Bench37.3%Not measuredOnly Claude Sonnet 5 measured
WeirdML68.8%78.3%GPT-5.6 Terra
ALE-Bench1463.11951.4GPT-5.6 Terra
LMArena Text: coding14831485GPT-5.6 Terra
LMArena Text: software and IT14741482GPT-5.6 Terra
LMArena WebDev: React15411513Claude Sonnet 5
LMArena WebDev: HTML15271526Claude Sonnet 5
LMArena WebDev: from an image15401541GPT-5.6 Terra
SciCode10.7%10.8%GPT-5.6 Terra
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Sonnet 5 and GPT-5.6 Terra
BenchmarkClaude Sonnet 5GPT-5.6 TerraLeader
AA Intelligence Index38.242.1GPT-5.6 Terra
Epoch Capabilities Index156.9160.1GPT-5.6 Terra
Agentic workLike-for-likePublic boards, shown as published, kept out of the index118
Agentic work benchmarks for Claude Sonnet 5 and GPT-5.6 Terra
BenchmarkClaude Sonnet 5GPT-5.6 TerraLeader
AA Agentic Index43.643.2Claude Sonnet 5
Design Arena: agents building web apps12451120Claude Sonnet 5
Design Arena: agents building full-stack apps12491061Claude Sonnet 5
Design Arena: agents building mobile apps12151111Claude Sonnet 5
Design Arena: agents building Android apps12271062Claude Sonnet 5
Design Arena: agents building Godot games1225Not measuredOnly Claude Sonnet 5 measured
Design Arena: agents building games12271083Claude Sonnet 5
Design Arena: HTML slides11681058Claude Sonnet 5
Design Arena: PowerPoint slides11911105Claude Sonnet 5
Design Arena: spreadsheets1035Not measuredOnly Claude Sonnet 5 measured
LiveBench research82.8%60.4%Claude Sonnet 5
LiveBench browser72.0%84.0%GPT-5.6 Terra
LiveBench long agentic39.0%48.4%GPT-5.6 Terra
SREBench (Vals AI)0.4%9.5%GPT-5.6 Terra
Finance Agent (Vals AI)53.9%54.4%GPT-5.6 Terra
Tax Agent Bench (Vals AI)29.4%30.0%GPT-5.6 Terra
Legal Research Bench (Vals AI)41.8%41.4%Claude Sonnet 5
Excel Modeling Benchmark (Vals AI)66.3%66.2%Claude Sonnet 5
Terminal-Bench-Science (Vals AI)5.7%10.0%GPT-5.6 Terra
τ²-Bench TelecomNot measured86.3%Only GPT-5.6 Terra measured
APEX-Agents54.5%58.2%GPT-5.6 Terra
BALROGNot measured53.2%Only GPT-5.6 Terra measured
Vending-Bench 2$6,378$7,343GPT-5.6 Terra
Neither model has a result on the other 18 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index112
Reasoning benchmarks for Claude Sonnet 5 and GPT-5.6 Terra
BenchmarkClaude Sonnet 5GPT-5.6 TerraLeader
GPQA Diamond88.9%90.9%GPT-5.6 Terra
LiveBench reasoning88.7%90.6%GPT-5.6 Terra
MMMU Pro (Vals AI)83.0%86.5%GPT-5.6 Terra
GPQA Diamond (Artificial Analysis run)91.1%92.5%GPT-5.6 Terra
Humanity's Last Exam (Artificial Analysis run)41.3%42.9%GPT-5.6 Terra
GPQA Diamond (Epoch AI run)90.5%93.3%GPT-5.6 Terra
ARC-AGINot measured96.5%Only GPT-5.6 Terra measured
ARC-AGI-2Not measured83.9%Only GPT-5.6 Terra measured
SimpleBench60.6%48.9%Claude Sonnet 5
Chess puzzles45.0%47.0%GPT-5.6 Terra
Mystery game puzzles35.0%35.0%Tie
LMArena Text: hard prompts14611469GPT-5.6 Terra
LMArena Text: expert14891496GPT-5.6 Terra
LMArena Text: hard prompts in English14641465GPT-5.6 Terra
LMArena Vision: diagrams12931295GPT-5.6 Terra
LMArena Vision: homework13111312GPT-5.6 Terra
Kagi LLM BenchmarkNot measured51.3%Only GPT-5.6 Terra measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index33
Math benchmarks for Claude Sonnet 5 and GPT-5.6 Terra
BenchmarkClaude Sonnet 5GPT-5.6 TerraLeader
OTIS Mock AIME94.7%99.7%GPT-5.6 Terra
FrontierMath, tiers 1 to 365.6%86.0%GPT-5.6 Terra
FrontierMath, tier 429.3%70.7%GPT-5.6 Terra
ProofBench77.0%74.0%Claude Sonnet 5
LMArena Text: math14671465Claude Sonnet 5
LMArena Text: mathematical work14811478Claude Sonnet 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index65
Knowledge benchmarks for Claude Sonnet 5 and GPT-5.6 Terra
BenchmarkClaude Sonnet 5GPT-5.6 TerraLeader
MMLU Pro87.5%86.7%Claude Sonnet 5
LegalBench (Vals AI)83.9%85.1%GPT-5.6 Terra
CorpFin (Vals AI)67.0%65.3%Claude Sonnet 5
TaxEval (Vals AI)75.6%76.2%GPT-5.6 Terra
MortgageTax (Vals AI)70.0%67.3%Claude Sonnet 5
MedCode (Vals AI)47.5%43.4%Claude Sonnet 5
SimpleQA Verified33.7%43.2%GPT-5.6 Terra
LMArena Text: science14601452Claude Sonnet 5
LMArena Text: medicine and healthcare14421430Claude Sonnet 5
LMArena Text: legal and government14541461GPT-5.6 Terra
LMArena Text: business and finance14361448GPT-5.6 Terra
FACTS Benchmark SuiteNot measured52.0%Only GPT-5.6 Terra measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index81
Web design benchmarks for Claude Sonnet 5 and GPT-5.6 Terra
BenchmarkClaude Sonnet 5GPT-5.6 TerraLeader
Design Arena: websites12741268Claude Sonnet 5
Design Arena: UI components12771256Claude Sonnet 5
Design Arena: game dev12771229Claude Sonnet 5
Design Arena: data viz12511240Claude Sonnet 5
Design Arena: 3D12611134Claude Sonnet 5
Design Arena: all code categories12751241Claude Sonnet 5
Design Arena: SVG11921219GPT-5.6 Terra
Design Arena: ASCII art12071177Claude Sonnet 5
LiveBench design82.0%76.0%Claude Sonnet 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index1221
General benchmarks for Claude Sonnet 5 and GPT-5.6 Terra
BenchmarkClaude Sonnet 5GPT-5.6 TerraLeader
LiveBench data analysis71.7%79.3%GPT-5.6 Terra
Public Benefits Bench (Vals AI)66.0%62.4%Claude Sonnet 5
SAGE (Vals AI)48.9%47.0%Claude Sonnet 5
MedScribe (Vals AI)76.0%82.9%GPT-5.6 Terra
Vals Multimodal Index68.8%65.1%Claude Sonnet 5
IFBenchNot measured71.2%Only GPT-5.6 Terra measured
Long context reasoning (AA-LCR)82.0%83.0%GPT-5.6 Terra
DTBench92.5%93.3%GPT-5.6 Terra
LMCA50.0%54.9%GPT-5.6 Terra
Surface Evolver Bench60.0%83.8%GPT-5.6 Terra
Furniture assemblyNot measured54.2%Only GPT-5.6 Terra measured
LMArena Text14421448GPT-5.6 Terra
LMArena Text: instruction following14521456GPT-5.6 Terra
LMArena Text: creative writing14161413Claude Sonnet 5
LMArena Vision12731271Claude Sonnet 5
LMArena Text: English14501449Claude Sonnet 5
LMArena Text: non-English14311441GPT-5.6 Terra
LMArena Text: Chinese14781514GPT-5.6 Terra
LMArena Text: German14421460GPT-5.6 Terra
LMArena Text: Japanese14221454GPT-5.6 Terra
LMArena Text: Korean14121427GPT-5.6 Terra
LMArena Text: French14631466GPT-5.6 Terra
LMArena Text: Spanish14381451GPT-5.6 Terra
LMArena Text: Russian14501452GPT-5.6 Terra
LMArena Text: Polish14251446GPT-5.6 Terra
LMArena Text: multi-turn14531453Claude Sonnet 5
LMArena Text: longer queries14621454Claude Sonnet 5
LMArena Text: writing and language14361431Claude Sonnet 5
LMArena Text: entertainment and media14111418GPT-5.6 Terra
LMArena Vision: English12751272Claude Sonnet 5
LMArena Vision: Chinese13311337GPT-5.6 Terra
LMArena Vision: reading text12881278Claude Sonnet 5
LMArena Vision: humor12611236Claude Sonnet 5
LMArena Vision: creative writing12461248GPT-5.6 Terra
LMArena Document14661472GPT-5.6 Terra
Neither model has a result on the other 11 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 5 and GPT-5.6 Terra
BenchmarkClaude Sonnet 5GPT-5.6 TerraLeader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Sonnet 5$0.0070Fits in one request
GPT-5.6 Terra$0.0080Fits in one request

Claude Sonnet 5 costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 5$0.130Fits in one request
GPT-5.6 Terra$0.136Fits in one request

Claude Sonnet 5 costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 5$0.500Fits in one request
GPT-5.6 Terra$0.520Fits in one request

Claude Sonnet 5 costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Sonnet 5 and GPT-5.6 Terra
SpecificationAnthropic Claude Sonnet 5OpenAI GPT-5.6 Terra
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 30, 2026July 9, 2026
Context window1M1.05M
Input $/Mtok$2.00$2.00
Output $/Mtok$10.00$12.00
Coding index57.763.9
Independent measurements behind it66
Cost per solved task$1.87$0.42
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 5 better than GPT-5.6 Terra for coding?

Pick GPT-5.6 Terra for coding: it scores 63.9 on the Vibe Coding Index against 57.7 for Claude Sonnet 5. Pick Claude Sonnet 5 for output tokens 1.2x cheaper ($10.00 vs $12.00 per million) and work measured by LMArena WebDev or Vibe Code Bench (Vals AI), where it leads.

Which is cheaper, Claude Sonnet 5 or GPT-5.6 Terra?

Claude Sonnet 5 costs $2.00 per million input tokens and $10.00 per million output tokens; GPT-5.6 Terra costs $2.00 and $12.00. Per solved SWE-bench Verified task, Claude Sonnet 5 costs $1.87 and GPT-5.6 Terra $0.42.

Which has the bigger context window, Claude Sonnet 5 or GPT-5.6 Terra?

GPT-5.6 Terra, with 1.05M tokens against 1M.

How many benchmarks is the Claude Sonnet 5 vs GPT-5.6 Terra comparison based on?

118 benchmarks have a result for both models as of October 22, 2026. Claude Sonnet 5's coding index rests on 6 independent benchmarks and GPT-5.6 Terra's on 6. Where only one model has a result, the page says so instead of naming a winner.

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