Anthropic removed the catalog entry for claude-fable-5 (input $10/MTok, output $50/MTok, context 1M tokens, described as "Next-generation intelligence for long-running agents") and simultaneously added claude-fable-5-1 (input $10/MTok, output $50/MTok, context 1M tokens, described as "For demanding reasoning and long-horizon agentic work") and a second new model claude-mythos-5-1 (input $10/MTok, output $50/MTok, noted "limited availability"). Both new models received batch-tier SKUs at input $5/MTok and output $25/MTok. Headline pricing was held flat. The addition of a second distinct model slug — mythos alongside fable — suggests Anthropic is differentiating its frontier portfolio, relevant to competitive positioning against OpenAI and Google on the model-capability axis.
Every field of each cited change, before and after.
| Field | Before | After |
|---|---|---|
| cached_input_per_mtok | ∅ | ∅ |
| context_window | 1M tokens | ∅ |
| currency | USD | ∅ |
| effective_from | ∅ | ∅ |
| effective_until | ∅ | ∅ |
| input_per_mtok | 10 | ∅ |
| model_slug | claude-fable-5 | ∅ |
| notes | Next-generation intelligence for long-running agents | ∅ |
| output_per_mtok | 50 | ∅ |
| provider | anthropic | ∅ |
| tier | ∅ | ∅ |
| Field | Before | After |
|---|---|---|
| cached_input_per_mtok | ∅ | 0.25 |
| context_window | ∅ | ∅ |
| currency | ∅ | USD |
| effective_from | ∅ | ∅ |
| effective_until | ∅ | ∅ |
| input_per_mtok | ∅ | 10 |
| model_slug | ∅ | claude-fable-5-1 |
| notes | ∅ | 5m cache writes $12.50 / MTok; 1h cache writes $20 / MTok |
| output_per_mtok | ∅ | 50 |
| provider | ∅ | anthropic |
| tier | ∅ | ∅ |
| Field | Before | After |
|---|---|---|
| cached_input_per_mtok | ∅ | ∅ |
| context_window | ∅ | 1M tokens |
| currency | ∅ | USD |
| effective_from | ∅ | ∅ |
| effective_until | ∅ | ∅ |
| input_per_mtok | ∅ | 10 |
| model_slug | ∅ | claude-fable-5-1 |
| notes | ∅ | For demanding reasoning and long-horizon agentic work |
| output_per_mtok | ∅ | 50 |
| provider | ∅ | anthropic |
| tier | ∅ | ∅ |
| Field | Before | After |
|---|---|---|
| cached_input_per_mtok | ∅ | 0.25 |
| context_window | ∅ | ∅ |
| currency | ∅ | USD |
| effective_from | ∅ | ∅ |
| effective_until | ∅ | ∅ |
| input_per_mtok | ∅ | 10 |
| model_slug | ∅ | claude-mythos-5-1 |
| notes | ∅ | limited availability; 5m cache writes $12.50 / MTok; 1h cache writes $20 / MTok |
| output_per_mtok | ∅ | 50 |
| provider | ∅ | anthropic |
| tier | ∅ | ∅ |
| Field | Before | After |
|---|---|---|
| cached_input_per_mtok | ∅ | ∅ |
| context_window | ∅ | ∅ |
| currency | ∅ | USD |
| effective_from | ∅ | ∅ |
| effective_until | ∅ | ∅ |
| input_per_mtok | ∅ | 5 |
| model_slug | ∅ | claude-fable-5-1 |
| notes | ∅ | ∅ |
| output_per_mtok | ∅ | 25 |
| provider | ∅ | anthropic |
| tier | ∅ | batch |
| Field | Before | After |
|---|---|---|
| cached_input_per_mtok | ∅ | ∅ |
| context_window | ∅ | ∅ |
| currency | ∅ | USD |
| effective_from | ∅ | ∅ |
| effective_until | ∅ | ∅ |
| input_per_mtok | ∅ | 5 |
| model_slug | ∅ | claude-mythos-5-1 |
| notes | ∅ | limited availability |
| output_per_mtok | ∅ | 25 |
| provider | ∅ | anthropic |
| tier | ∅ | batch |
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