vs
1:0
overall capability wins (0 ties across 1 scored). Hy4 Preview leads overall.
- Specs1:0
Verdict
Hy4 Preview offers ~7.8x larger context (1M vs 128K); Hy4 Preview ships open weights (Apache 2.0).
- Hy4 Preview offers ~7.8x larger context (1M vs 128K)
- Hy4 Preview ships open weights (Apache 2.0)
Cost for 1M in + 250K out
Illustrative chat workload at primary-provider list prices.
- Hy4 Preview
- $1.46
- SeedRealtime
- -
Price per 1M tokens
Full comparison
Organization
Tencent
ByteDance
Family
Other
Other
License
Apache 2.0
Proprietary
Open weights
Yes
No
Release
Aug 28, 2026
Aug 5, 2026
Knowledge cutoff
-
-
API / provider
Tencent Cloud TokenHub
No primary API price listed
Modalities
text → text
text, audio, video → text, audio
Specs
Context window
1M
128K
Max output
-
-
Parameters
770B (49B act.)
—
Pricing
Input $/1M
$0.83
—
Output $/1M
$2.50
—
Blended $/1M (3∶1)
$1.25
-
Speed
tok/s
-
-
TTFT (s)
-
-
Reasoning
MMLU-Pro
—
—
GPQA Diamond
92.3
—
Humanity's Last Exam
—
—
AIME 2025
—
—
MATH-500
—
—
Humanity's Last Exam (with tools)
—
—
AA-Omniscience Accuracy
—
—
AA-LCR v1.1
—
—
CritPt
—
—
MMMU-Pro
—
—
IFBench
—
—
Chartography
—
—
Chartography (With Tools)
—
—
Coding
SWE-bench Verified
—
—
SWE-bench Pro
65.7
—
SWE-bench Multilingual
82.9
—
LiveCodeBench
—
—
Terminal-Bench 2.1
85.4
—
Aider Polyglot
—
—
Terminal-Bench 3
—
—
BigCodeBench
—
—
SciCode
—
—
CursorBench
—
—
SWE-Rebench
—
—
NL2Repo-Bench
—
—
DeepSWE
64.3
—
WebDev Arena
1,624
—
Terminal-Bench 4.0
—
—
CursorBench 4.0
—
—
FrontierCode v1.1 (Main)
—
—
Arena
LMArena Elo
—
—
| Metric | Hy4 Preview | SeedRealtime | Delta |
|---|---|---|---|
| Identity | |||
| Organization | Tencent | ByteDance | — |
| Family | Other | Other | — |
| License | Apache 2.0 | Proprietary | — |
| Open weights | Yes | No | — |
| Release | Aug 28, 2026 | Aug 5, 2026 | — |
| Knowledge cutoff | - | - | — |
| API / provider | Tencent Cloud TokenHub | No primary API price listed | — |
| Modalities | text → text | text, audio, video → text, audio | — |
| Specs | |||
| Context window | 1M | 128K | A +872K |
| Max output | - | - | — |
| Parameters | 770B (49B act.) | — | — |
| Pricing | |||
| Input $/1M | $0.83 | — | — |
| Output $/1M | $2.50 | — | — |
| Blended $/1M (3∶1) | $1.25 | - | — |
| Speed | |||
| tok/s | - | - | — |
| TTFT (s) | - | - | — |
| Reasoning | |||
| MMLU-Pro | — | — | — |
| GPQA Diamond | 92.3 | — | — |
| Humanity's Last Exam | — | — | — |
| AIME 2025 | — | — | — |
| MATH-500 | — | — | — |
| Humanity's Last Exam (with tools) | — | — | — |
| AA-Omniscience Accuracy | — | — | — |
| AA-LCR v1.1 | — | — | — |
| CritPt | — | — | — |
| MMMU-Pro | — | — | — |
| IFBench | — | — | — |
| Chartography | — | — | — |
| Chartography (With Tools) | — | — | — |
| Coding | |||
| SWE-bench Verified | — | — | — |
| SWE-bench Pro | 65.7 | — | — |
| SWE-bench Multilingual | 82.9 | — | — |
| LiveCodeBench | — | — | — |
| Terminal-Bench 2.1 | 85.4 | — | — |
| Aider Polyglot | — | — | — |
| Terminal-Bench 3 | — | — | — |
| BigCodeBench | — | — | — |
| SciCode | — | — | — |
| CursorBench | — | — | — |
| SWE-Rebench | — | — | — |
| NL2Repo-Bench | — | — | — |
| DeepSWE | 64.3 | — | — |
| WebDev Arena | 1,624 | — | — |
| Terminal-Bench 4.0 | — | — | — |
| CursorBench 4.0 | — | — | — |
| FrontierCode v1.1 (Main) | — | — | — |
| Arena | |||
| LMArena Elo | — | — | — |
Hy4 Preview
- Context
- 1M
- Parameters
- 770B (49B act.)
- Price
- $0.83 / $2.50
- Speed
- —
- Modalities
- text → text
- License
- Apache 2.0
Tencent Hy Team's Aug 28, 2026 open-weight flagship (770B MoE / 49B active, Apache 2.0) with a 1M context window and default high reasoning effort. Text-only instruct weights on Hugging Face; hosted API at $0.834/$2.501 per 1M tokens via TokenHub and OpenRouter.
SeedRealtime
- Context
- 128K
- Parameters
- —
- Price
- —
- Speed
- —
- Modalities
- text, audio, video → text, audio
- License
- Proprietary
Native audio-visual full-duplex LLM — unified end-to-end perception, understanding, and speech generation for real-time watch-listen-speak interaction; rolled out in Doubao app (no public API yet).
Benchmark charts
Winner bars are emphasized. Per-benchmark deltas sit above each chart.
These two models have no overlapping published benchmarks in our dataset. Compare specs and pricing instead.