Claude Fable 5 vs GPT-5.1-Codex-Mini
A side-by-side comparison of two multimodal models — real specs, pricing, strengths and weaknesses, and a clear verdict on which to choose. Kept current by our agents.
Quick verdict: which should you choose?
Choose Claude Fable 5 if you need
- ✓Coherent handling of 1M-token contexts with detailed file-based reasoning
- ✓Highest intelligence index (59.9) and strong text-visual integration
- ✓Safety-aligned responses on sensitive or complex multimodal tasks
- ✓Maximum context size for extended non-coding analysis
Choose GPT-5.1-Codex-Mini if you need
- ✓Fast output at 212.57 t/s and low cost of $2 per 1M tokens
- ✓Strong coding specialization in extended technical workflows
- ✓Native image + text support within a 400k context window
- ✓Budget-friendly multimodal coding with acceptable speed
Verdict
Claude Fable 5 leads in raw intelligence (59.9 vs 30.6) and maximum context length (1M vs 400k tokens) with stronger multimodal integration and safety alignment, making it preferable for complex, large-scale inputs. GPT-5.1-Codex-Mini wins on speed (212.57 t/s), price ($2 vs $50 per 1M tokens), and coding specialization for technical workflows. The models trade depth and scale against efficiency and cost.
Claude Fable 5 vs GPT-5.1-Codex-Mini: side by side
| Spec | Claude Fable 5 | GPT-5.1-Codex-Mini | Winner |
|---|---|---|---|
| Intelligence | 59.9 | 30.6 | Claude Fable 5 |
| Output speed | — | 213 t/s | Tie |
| Output price | $50.00/1M | $2.00/1M | GPT-5.1-Codex-Mini |
| Context | 1000K | 400K | Claude Fable 5 |
| Params | — | — | Tie |
| Provider | Anthropic | OpenAI | Tie |
Detailed analysis
Intelligence
Winner: Claude Fable 5Claude Fable 5 scores 59.9 on the intelligence index compared to GPT-5.1-Codex-Mini's 30.6. This gap indicates superior performance on complex reasoning and multimodal integration tasks. GPT's lower score aligns with its noted limitation of reduced depth on complex reasoning as a mini variant.
Context & Modalities
Winner: Claude Fable 5Claude Fable 5 offers a 1M-token context versus GPT-5.1-Codex-Mini's 400k tokens. It provides stronger integration of text and visual inputs plus detailed file-based reasoning, while GPT is limited to image and text modalities with a noted trade-off between context size and speed.
Pricing & Speed
Winner: GPT-5.1-Codex-MiniGPT-5.1-Codex-Mini is priced at $2 per 1M tokens versus Claude Fable 5's $50 per 1M tokens and delivers a measured speed of 212.57 t/s. Claude's speed is unspecified but its limitations note slower inference at maximum context lengths.
Specialization
Winner: GPT-5.1-Codex-MiniGPT-5.1-Codex-Mini is explicitly positioned as a coding model suited for extended technical workflows. Claude Fable 5 emphasizes general multimodal coherence and safety alignment without coding-specific strengths listed.
Claude Fable 5
Pros
- +Coherent handling of very large contexts
- +Strong integration of text and visual inputs
- +Safety-aligned responses
Cons
- –May decline edge-case or sensitive requests
- –Slower inference on maximum context lengths
- –No native audio or video support
GPT-5.1-Codex-Mini
Pros
- +Very large context window
- +Strong coding specialization
- +Native image + text support
Cons
- –Mini variant may have reduced depth on complex reasoning
- –Limited to image and text modalities
- –Trade-off between context size and response speed
Summary: Claude Fable 5 vs GPT-5.1-Codex-Mini
Select Claude Fable 5 when maximum context, intelligence, and careful multimodal reasoning are required. Choose GPT-5.1-Codex-Mini for fast, affordable coding-focused work within a still-large but smaller context. The choice hinges on whether scale and depth or speed and cost matter most.
Frequently asked questions
Claude Fable 5 is stronger on intelligence and context size while GPT-5.1-Codex-Mini excels in speed, price, and coding tasks; neither is universally better.