GPT-5.4 is OpenAI’s latest frontier model, unifying the Codex and GPT lines into a single system. It features a 1M+ token context window (922K input, 128K output) with support for text and image inputs, enabling high-context reasoning, codi…
Model details →OpenAI: GPT-5.4 vs Writer: Palmyra X5
OpenAI: GPT-5.4 wins on 4 of 6 axes — pricing and capability skew in its favour for most workloads.
Palmyra X5 is Writer's most advanced model, purpose-built for building and scaling AI agents across the enterprise. It delivers industry-leading speed and efficiency on context windows up to 1 million tokens, powered by a novel transformer …
Model details →Side-by-side comparison
| Capability | OpenAI: GPT-5.4 | Writer: Palmyra X5 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1.1M | 1.0M | 🏆 OpenAI: GPT-5.4 |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $2.50 | $0.60 | 🏆 Writer: Palmyra X5 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $15.00 | $6.00 | 🏆 Writer: Palmyra X5 |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | — | 🏆 OpenAI: GPT-5.4 |
| Vision input Accepts image inputs alongside text. | Yes | — | 🏆 OpenAI: GPT-5.4 |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | — | 🏆 OpenAI: GPT-5.4 |
Frequently asked questions
Is OpenAI: GPT-5.4 better than Writer: Palmyra X5?
OpenAI: GPT-5.4 wins on 4 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between OpenAI: GPT-5.4 and Writer: Palmyra X5?
Input: $2.50 vs $0.60 per 1M tokens. Output: $15.00 vs $6.00 per 1M tokens.
What context windows do OpenAI: GPT-5.4 and Writer: Palmyra X5 support?
OpenAI: GPT-5.4 supports up to 1.1M tokens. Writer: Palmyra X5 supports up to 1.0M tokens.
Do both OpenAI: GPT-5.4 and Writer: Palmyra X5 support tool calling?
OpenAI: GPT-5.4: yes. Writer: Palmyra X5: not advertised.