GPT-5.4 vs Grok 4 for Creative Writing

What Creative Writing demands: imaginative idea generation, voice/persona consistency across scenes, constrained rewriting (flash fiction, tight word counts), long-context memory for serialized stories, and safety calibration to avoid harmful or inappropriate content. In our testing the task score is the primary metric: GPT-5.4 = 4.333333333333333, Grok 4 = 4.0. Supporting scores from our 3 subtests: creative problem solving (GPT-5.4 4 vs Grok 4 3), persona consistency (both 5), constrained rewriting (both 4). Additional relevant signals: long context (both 5) and faithfulness (both 5) — useful when continuing source material. GPT-5.4 also scores higher on safety calibration (5 vs 2) and agentic planning (5 vs 3), which affect multi-chapter planning, revision prompts, and safe content gating. Context windows matter for long-form work: GPT-5.4 has a 1,050,000-token window and 128,000 max output tokens; Grok 4 has a 256,000-token window. Cost and API parameters: GPT-5.4 input = $2.50/mtok, output = $15/mtok; Grok 4 input = $3.00/mtok, output = $15/mtok. All benchmark claims above are from our testing.

Where GPT-5.4 shines (based on our scores):

• Serial novel drafting: its long context (5) plus a 1,050,000-token window and 128,000 max output tokens let you keep multi-chapter continuity and scene-level memory. GPT-5.4's agentic planning 5 helps decompose plot arcs and recover from revisions.
• Idea-generation and unexpected plot beats: creative problem solving 4 vs Grok 4's 3 — GPT-5.4 produced more non-obvious, executable ideas in our tests.
• Safety-sensitive creative briefs: safety calibration 5 vs 2 means GPT-5.4 better balances creative edge with safer refusals in our evaluation. Where Grok 4 shines (based on our scores):
• Genre tagging and automated routing of creative outputs: Grok 4's classification 4 vs GPT-5.4's 3 — useful when building pipelines that auto-categorize drafts.
• Tight-format rewrites and parity tasks: constrained rewriting ties at 4, so Grok 4 matches GPT-5.4 for flash fiction and strict-length tasks.
• Cost/throughput considerations: both have identical output cost ($15/mtok) but Grok 4 has slightly higher input cost ($3.00 vs $2.50); choose based on your tolerance for input token spending. Examples grounded in numbers from our testing: GPT-5.4 (task score 4.33, creative problem solving 4, safety calibration 5, context_window 1,050,000) vs Grok 4 (task score 4.00, creative problem solving 3, safety calibration 2, context_window 256,000).

For Creative Writing, choose GPT-5.4 if you need stronger idea generation, safer outputs, multi-chapter continuity, and planning support (GPT-5.4: 4.33 vs Grok 4: 4.00 in our tests). Choose Grok 4 if you need competitive long-context performance with slightly better classification for routing or prefer its API parameter set; Grok 4 remains competent on persona and constrained rewriting but trails on creative problem solving and safety in our benchmarks.