Claude Fable 5 vs GPT-4.1 Nano
Benchmark Performance
Available Benchmarks
| Benchmark | Claude Fable 5 | GPT-4.1 Nano |
|---|---|---|
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,494.40100% of row best · rating · claude-fable-5; 95% CI [1489.42750707, 1499.38052801]; votes 26977; rank 5 | 1,284.6486% of row best · rating · gpt-4.1-nano-2025-04-14; 95% CI [1276.99177350, 1292.27849322]; votes 6103; rank 246 |
| LMArena Vision Arenavision-2026-08-27-011508720696 · arena_rating · leader | 1,329.46100% of row best · rating · claude-fable-5; 95% CI [1321.03632319, 1337.88661881]; votes 10002; rank 1 | 1,063.2380% of row best · rating · gpt-4.1-nano-2025-04-14; 95% CI [1044.95116252, 1081.50991534]; votes 1211; rank 120 |
| Overall ResultCounted from the protocol-matched rows above | 2 benchmark winsOverall lead | 0 benchmark wins |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Technical Differences
Side-by-Side Facts
| Field | Claude Fable 5 | GPT-4.1 Nano |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Family | Claude 5 | Gpt 4 1 |
| Model | Claude Fable 5 | GPT-4.1 Nano |
| Version | Claude Fable 5 | GPT-4.1 Nano |
| Lifecycle | active | active |
| Released | 2026-06-09 | Unknown |
| Knowledge cutoff | Unknown | 2024-06-01 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,000,000 | 1,047,576 |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Anthropic (Standard), Deepinfra (Standard), Openrouter (Standard) | OpenAI (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, tools |
13 comparable fields · 7 material differences · Pair passes the primary-source comparison gate
Claude Fable 5 Capabilities
GPT-4.1 Nano Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
Claude Fable 5Anthropic | vs | Claude Fable 5.1Anthropic | family variantsimage, text |
Claude Fable 5Anthropic | vs | Claude Mythos 5.1Anthropic | family variantsimage, text |
Claude Fable 5Anthropic | vs | Claude Opus 4.8Anthropic | family variantsimage, text |
Claude Fable 5Anthropic | vs | Claude Haiku 4.5Anthropic | family variantsimage, text |
GPT-4.1 NanoOpenAI | vs | GPT-4oOpenAI | family variantsimage, text |
GPT-4.1 NanoOpenAI | vs | GPT-4o MiniOpenAI | family variantsimage, text |
GPT-4.1 NanoOpenAI | vs | GPT-5.6 LunaOpenAI | family variantsimage, text |
GPT-4.1 NanoOpenAI | vs | GPT-5.6 SolOpenAI | family variantsimage, text |
 MiniMax-M3MiniMax | vs | Claude Fable 5Anthropic | cross-developer peersimage, text |
Claude Fable 5Anthropic | vs | GPT-5.6 LunaOpenAI | cross-developer peersimage, text |
Claude Fable 5Anthropic | vs | GPT-5.6 SolOpenAI | cross-developer peersimage, text |
Claude Fable 5Anthropic | vs | GPT-5.6 TerraOpenAI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Fable 5 vs GPT-4.1 Nano FAQs
Is Claude Fable 5 or GPT-4.1 Nano better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Fable 5 and GPT-4.1 Nano, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Fable 5 or GPT-4.1 Nano?+
Claude Fable 5 is $10.00 and GPT-4.1 Nano is $0.050 per million tokens, so GPT-4.1 Nano is cheaper on this metric. Claude Fable 5 is $50.00 and GPT-4.1 Nano is $0.20 per million tokens, so GPT-4.1 Nano is cheaper on this metric.
Which has a larger context window, Claude Fable 5 or GPT-4.1 Nano?+
GPT-4.1 Nano has the larger sourced context window. Claude Fable 5 supports 1,000,000 and GPT-4.1 Nano supports 1,047,576.
Which performs better in benchmarks, Claude Fable 5 or GPT-4.1 Nano?+
There is no overall benchmark winner: An overall winner requires at least two decisive benchmarks from at least two original publishers.
Can Claude Fable 5 or GPT-4.1 Nano be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Fable 5 is not marked open weight; GPT-4.1 Nano is not marked open weight.
Can Claude Fable 5 and GPT-4.1 Nano understand images?+
Claude Fable 5 is documented with image input; GPT-4.1 Nano is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Fable 5 or GPT-4.1 Nano?+
Claude Fable 5 has the larger sourced maximum output: Claude Fable 5 supports 128,000 and GPT-4.1 Nano supports 32,768 output tokens.
Do Claude Fable 5 and GPT-4.1 Nano support reasoning and tool use?+
Claude Fable 5: reasoning, tool calling, and image input. GPT-4.1 Nano: tool calling and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Fable 5 or GPT-4.1 Nano?+
Claude Fable 5 has 3 sourced provider routes; GPT-4.1 Nano has 2, so Claude Fable 5 has broader tracked availability.
Which offers better value, Claude Fable 5 or GPT-4.1 Nano?+
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.