High-volume, cost-sensitive work
Choose GPT-4 Turbo
GPT-4 Turbo costs 25% less on a typical mix of three input tokens for every output token ($15.00 against $20.00 per million tokens).
Claude Fable 5.1 vs GPT-4 Turbo: price, context and capabilities
Choose Claude Fable 5.1 for very long inputs, the latest release and the most recent knowledge. Choose GPT-4 Turbo for high-volume, cost-sensitive work and writing and code generation.
In short
- GPT-4 Turbo is 25% cheaper than Claude Fable 5.1 at the headline price ($15.00 / 1M tokens vs $20.00 / 1M tokens).
- Claude Fable 5.1 reads more per request: 1M tokens against 128k.
- Claude Fable 5.1 is the newer model (September 2026, against Apr 9, 2024).
- Only Claude Fable 5.1 offers reasoning, prompt caching.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Writing and code generation
Choose GPT-4 Turbo
GPT-4 Turbo charges $30.00 per million output tokens, against $50.00 for Claude Fable 5.1. Output dominates the bill when answers are long.
Very long inputs
Choose Claude Fable 5.1
Claude Fable 5.1 reads up to 1M tokens per request, against 128k for GPT-4 Turbo.
Latest release
Choose Claude Fable 5.1
Claude Fable 5.1 is the newer release (September 2026, against Apr 9, 2024 for GPT-4 Turbo).
Most recent knowledge
Choose Claude Fable 5.1
Claude Fable 5.1 was trained on data up to June 2026, against December 2023 for GPT-4 Turbo.
Monthly cost at three volumes
| Volume | Claude Fable 5.1 | GPT-4 Turbo | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $22.50 | $17.50 | GPT-4 Turbo, $5.00 less |
| Production: 20M input, 5M output tokens | $450.00 | $350.00 | GPT-4 Turbo, $100.00 less |
| Scale: 500M input, 100M output tokens | $10,000 | $8,000 | GPT-4 Turbo, $2,000 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| Claude Fable 5.1 | GPT-4 Turbo | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Category | Language models | Language models |
| Status | Generally available | Deprecated |
| Headline price | $20.00 / 1M tokens | $15.00 / 1M tokens |
| Input | $10.00 / 1M tokens | $10.00 / 1M tokens |
| Output | $50.00 / 1M tokens | $30.00 / 1M tokens |
| Cached input | $0.25 / 1M tokens | No data |
| Context window | 1M | 128k |
| Max output | 128k | 4k |
| Released | September 2026 | Apr 9, 2024 |
| Knowledge cutoff | June 2026 | December 2023 |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Vision, Tool calling, Structured output, Batch API |
| API model id | claude-fable-5-1 | gpt-4-turbo |
Benchmarks side by side
Leader in bold.
| Benchmark | Claude Fable 5.1 | GPT-4 Turbo |
|---|---|---|
| Humanity's Last Exam | 59.1% | 3.1% |
| Intelligence Index | 53.4 | No data |
| SciCode | 63.1% | No data |
| GPQA Diamond | 93.7% | No data |
| Long-context reasoning (AA-LCR) | 85.3% | No data |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose Claude Fable 5.1 or GPT-4 Turbo?
Choose Claude Fable 5.1 for very long inputs, the latest release and the most recent knowledge. Choose GPT-4 Turbo for high-volume, cost-sensitive work and writing and code generation.
Which is cheaper, Claude Fable 5.1 or GPT-4 Turbo?
GPT-4 Turbo is 25% cheaper than Claude Fable 5.1 at the headline price ($15.00 / 1M tokens vs $20.00 / 1M tokens).
Which has the larger context window, Claude Fable 5.1 or GPT-4 Turbo?
Claude Fable 5.1 reads more per request: 1M tokens against 128k.
What is the difference between Claude Fable 5.1 and GPT-4 Turbo?
Claude Fable 5.1 is made by Anthropic and GPT-4 Turbo by OpenAI. GPT-4 Turbo is 25% cheaper than Claude Fable 5.1 at the headline price ($15.00 / 1M tokens vs $20.00 / 1M tokens). Claude Fable 5.1 reads more per request: 1M tokens against 128k. Claude Fable 5.1 is the newer model (September 2026, against Apr 9, 2024). Only Claude Fable 5.1 offers reasoning, prompt caching.
How much do Claude Fable 5.1 and GPT-4 Turbo cost per month?
At 20 million input and 5 million output tokens a month, Claude Fable 5.1 costs $450.00 and GPT-4 Turbo costs $350.00, at standard rates.
Which is newer, Claude Fable 5.1 or GPT-4 Turbo?
Claude Fable 5.1 was released on September 2026 and GPT-4 Turbo on Apr 9, 2024.