GPT-6.1 Terra vs Hy4
GPT-6.1 Terra leads Hy4 on coding, 77.4 to 65.2 on the Vibe Coding Index, and Hy4 costs 4.0x less per output token ($1.2505 vs $5.00 per million). Updated November 5, 2026; 6 benchmarks have a result for both.
GPT-6.1 Terra or Hy4: which to pick
Pick GPT-6.1 Terra for coding: it scores 77.4 on the Vibe Coding Index against 65.2 for Hy4.
Pick Hy4 for output tokens 4.0x cheaper ($1.2505 vs $5.00 per million) and work measured by Tax Agent Bench (Vals AI) or Legal Research Bench (Vals AI), where it leads.
- Shared results
- 6
- GPT-6.1 Terra only
- 35
- Hy4 only
- 0
- Like-for-like categories
- 3 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.
Coding
Vibe Coding Index, six public coding benchmarks
GPT-6.1 Terra
GPT-6.1 Terra scores 77.4 against 65.2.
4 and 2 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only GPT-6.1 Terra has a AA Intelligence Index result, 51.3.
Directional only
Web design
Design Arena: websites
No call
Only GPT-6.1 Terra has a Design Arena: websites result, 1288.
Directional only
General
Vals Index
GPT-6.1 Terra
GPT-6.1 Terra leads, 60.5% against 59.4%.
Same board, both measured
Long documents
Listed context window
GPT-6.1 Terra
GPT-6.1 Terra takes 1.05M tokens against 1.05M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Hy4
GPT-6.1 Terra $0.0035, Hy4 $0.0010 per turn.
List prices
At a glance
- Coding index
- GPT-6.1 Terra 77.4 from 4 benchmarks, Hy4 65.2 from 2 benchmarks.
- Widest category
- Agentic work, 14.5 points apart on average over 3 shared benchmarks.
- Widest single gap
- Tax Agent Bench (Vals AI): GPT-6.1 Terra 17.1% against Hy4 34.4%, 17.3 points apart on a 0 to 100 scale.
- Output price
- GPT-6.1 Terra $5.00 against Hy4 $1.2505 per million output tokens, 4.0x apart.
- Context window
- GPT-6.1 Terra takes 1.05M tokens, Hy4 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.
| Category | GPT-6.1 Terra | Bars | Hy4 | Ties |
|---|---|---|---|---|
| Coding | 2 | 0 | ||
| Agentic work | 0 | 3 | ||
| General | 1 | 0 | ||
| All shared boards | 3 | 3 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index20
| Benchmark | GPT-6.1 Terra | Hy4 | Leader |
|---|---|---|---|
| LiveBench coding | 94.3% | Not measured | Only GPT-6.1 Terra measured |
| LMArena WebDev | 1673 | Not measured | Only GPT-6.1 Terra measured |
| Terminal-Bench 4 (Vals AI) | 49.5% | 39.4% | GPT-6.1 Terra |
| Vibe Code Bench (Vals AI) | 84.0% | 81.0% | GPT-6.1 Terra |
| SciCode | 55.1% | Not measured | Only GPT-6.1 Terra measured |
| ALE-Bench | 2608.8 | Not measured | Only GPT-6.1 Terra measured |
| LMArena WebDev: React | 1657 | Not measured | Only GPT-6.1 Terra measured |
| LMArena WebDev: HTML | 1719 | Not measured | Only GPT-6.1 Terra measured |
| GameBench 2 | 85.7 | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 41 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | GPT-6.1 Terra | Hy4 | Leader |
|---|---|---|---|
| AA Intelligence Index | 51.3 | Not measured | Only GPT-6.1 Terra measured |
| Epoch Capabilities Index | 167.8 | Not measured | Only GPT-6.1 Terra measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index03
| Benchmark | GPT-6.1 Terra | Hy4 | Leader |
|---|---|---|---|
| Design Arena: agents building mobile apps | 1176 | Not measured | Only GPT-6.1 Terra measured |
| LiveBench research | 73.9% | Not measured | Only GPT-6.1 Terra measured |
| LiveBench browser | 93.1% | Not measured | Only GPT-6.1 Terra measured |
| LiveBench long agentic | 48.6% | Not measured | Only GPT-6.1 Terra measured |
| Tax Agent Bench (Vals AI) | 17.1% | 34.4% | Hy4 |
| Legal Research Bench (Vals AI) | 26.0% | 41.4% | Hy4 |
| Harvey's Legal Agent Benchmark (Vals AI) | 1.7% | 12.5% | Hy4 |
| APEX-Agents | 68.3% | Not measured | Only GPT-6.1 Terra measured |
| SpireClimb | 19.8% | Not measured | Only GPT-6.1 Terra measured |
| Vending-Bench 2 | $9,107 | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 34 boards here | |||
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
| Benchmark | GPT-6.1 Terra | Hy4 | Leader |
|---|---|---|---|
| LiveBench reasoning | 88.7% | Not measured | Only GPT-6.1 Terra measured |
| Humanity's Last Exam (Artificial Analysis run) | 46.2% | Not measured | Only GPT-6.1 Terra measured |
| GPQA Diamond (Epoch AI run) | 94.3% | Not measured | Only GPT-6.1 Terra measured |
| Mystery game puzzles | 74.0% | Not measured | Only GPT-6.1 Terra measured |
| EBR-bench | 78.1% | Not measured | Only GPT-6.1 Terra measured |
| Humanity's Last Exam (Scale run) | 35.7% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 18 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index3 boards, none shared
| Benchmark | GPT-6.1 Terra | Hy4 | Leader |
|---|---|---|---|
| OTIS Mock AIME | 100.0% | Not measured | Only GPT-6.1 Terra measured |
| FrontierMath, tiers 1 to 3 | 90.9% | Not measured | Only GPT-6.1 Terra measured |
| FrontierMath, tier 4 | 92.7% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 11 boards here | |||
KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | GPT-6.1 Terra | Hy4 | Leader |
|---|---|---|---|
| SimpleQA Verified | 57.3% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 19 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index5 boards, none shared
| Benchmark | GPT-6.1 Terra | Hy4 | Leader |
|---|---|---|---|
| Design Arena: websites | 1288 | Not measured | Only GPT-6.1 Terra measured |
| Design Arena: UI components | 1284 | Not measured | Only GPT-6.1 Terra measured |
| Design Arena: game dev | 1332 | Not measured | Only GPT-6.1 Terra measured |
| Design Arena: all code categories | 1302 | Not measured | Only GPT-6.1 Terra measured |
| LiveBench design | 82.3% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 4 boards here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | GPT-6.1 Terra | Hy4 | Leader |
|---|---|---|---|
| Vals Index | 60.5% | 59.4% | GPT-6.1 Terra |
| LiveBench data analysis | 82.3% | Not measured | Only GPT-6.1 Terra measured |
| Long context reasoning (AA-LCR) | 82.7% | Not measured | Only GPT-6.1 Terra measured |
| Furniture assembly | 79.2% | Not measured | Only GPT-6.1 Terra measured |
| MultiChallenge | 74.2% | Not measured | Only GPT-6.1 Terra measured |
| Neither model has a result on the other 43 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-6.1 Terra | Hy4 | Leader |
|---|---|---|---|
| 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
Hy4 costs less
Repository review
50K input + 3K output tokens
Hy4 costs less
Agent loop
200K input + 10K output tokens
Hy4 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.
| Specification | OpenAI GPT-6.1 Terra | Tencent Hy4 |
|---|---|---|
| Maker | OpenAI | Tencent |
| Weights | No public weights listed | Open weights |
| Released | October 26, 2026 | November 4, 2026 |
| Context window | 1.05M | 1.05M |
| Input $/Mtok | $1.00 | $0.417 |
| Output $/Mtok | $5.00 | $1.2505 |
| Coding index | 77.4 | 65.2 |
| Independent measurements behind it | 4 | 2 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT-6.1 Terra better than Hy4 for coding?
Pick GPT-6.1 Terra for coding: it scores 77.4 on the Vibe Coding Index against 65.2 for Hy4. Pick Hy4 for output tokens 4.0x cheaper ($1.2505 vs $5.00 per million) and work measured by Tax Agent Bench (Vals AI) or Legal Research Bench (Vals AI), where it leads.
Which is cheaper, GPT-6.1 Terra or Hy4?
GPT-6.1 Terra costs $1.00 per million input tokens and $5.00 per million output tokens; Hy4 costs $0.417 and $1.2505. Cost per solved task is known for neither of them.
Which has the bigger context window, GPT-6.1 Terra or Hy4?
GPT-6.1 Terra, with 1.05M tokens against 1.05M.
How many benchmarks is the GPT-6.1 Terra vs Hy4 comparison based on?
6 benchmarks have a result for both models as of November 5, 2026. GPT-6.1 Terra's coding index rests on 4 independent benchmarks and Hy4's on 2. Where only one model has a result, the page says so instead of naming a winner.