GPT-5.4 Pro vs Hy4 preview
Benchmark Performance
Available Benchmarks
Technical Differences
Side-by-Side Facts
| Field | GPT-5.4 Pro | Hy4 preview |
|---|---|---|
| Developer | OpenAI | Tencent |
| Family | Gpt 5 4 | Hy4 |
| Model | GPT-5.4 Pro | Hy4 preview |
| Version | GPT-5.4 Pro | Hy4 preview |
| Lifecycle | active | preview |
| Released | 2026-03-05 | 2026-08-28 |
| Knowledge cutoff | 2025-08-31 | Unknown |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
| Context window | 1,050,000 | 1,000,000 |
| Total parameters | Unknown | 770,000,000,000 |
| Active parameters | Unknown | 49,000,000,000 |
| License | Unknown | apache-2.0 |
| Open weights | No | Yes |
| API available | Yes | Yes |
| Self-hostable | No | Yes |
| Provider access | Openai (Standard), Openrouter (Standard) | Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, tools |
14 comparable fields · 12 material differences · Pair passes the primary-source comparison gate
GPT-5.4 Pro Capabilities
Hy4 preview Capabilities
Internal Comparison Graph
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Primary Evidence
Sources and Freshness
Questions
GPT-5.4 Pro vs Hy4 preview FAQs
Is GPT-5.4 Pro or Hy4 preview better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.4 Pro and Hy4 preview, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.4 Pro or Hy4 preview?+
GPT-5.4 Pro is $30.00 and Hy4 preview is $0.834 per million tokens, so Hy4 preview is cheaper on this metric. GPT-5.4 Pro is $180.00 and Hy4 preview is $2.501 per million tokens, so Hy4 preview is cheaper on this metric.
Which has a larger context window, GPT-5.4 Pro or Hy4 preview?+
GPT-5.4 Pro has the larger sourced context window. GPT-5.4 Pro supports 1,050,000 and Hy4 preview supports 1,000,000.
Which performs better in benchmarks, GPT-5.4 Pro or Hy4 preview?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can GPT-5.4 Pro or Hy4 preview be self-hosted?+
Hy4 preview is the only model in this pair currently marked as self-hostable. GPT-5.4 Pro is not marked open weight; Hy4 preview is open weight.
Can GPT-5.4 Pro and Hy4 preview understand images?+
GPT-5.4 Pro is documented with image input; Hy4 preview is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.4 Pro or Hy4 preview?+
Neither has a larger sourced maximum output. GPT-5.4 Pro is 128,000 and Hy4 preview is —.
Do GPT-5.4 Pro and Hy4 preview support reasoning and tool use?+
GPT-5.4 Pro: reasoning, tool calling, and image input. Hy4 preview: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5.4 Pro or Hy4 preview?+
GPT-5.4 Pro has 2 sourced provider routes; Hy4 preview has 1, so GPT-5.4 Pro has broader tracked availability.
Which offers better value, GPT-5.4 Pro or Hy4 preview?+
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.