Input price$10 USD / 1M input tokens; Claude API standard, global routing
Output price$50 USD / 1M output tokens; Claude API standard, global routing
Cached input price$0.25 USD / 1M cached input tokens; Claude API standard, global routing
ANTHROPIC · MODEL RELEASE TRACKER
Claude Fable 5.1
Claude Fable 5.1 is described in supplied reporting as Anthropic’s more advanced Claude model, noted for strong safety safeguards (including classifiers for biology, cybersecurity, and AI-development domains) and as a high-performance reference point in benchmark comparisons.CURRENT SNAPSHOT5/5 DIMENSIONS WITH DATA
The dimensions that change the decision.
Context window1,000,000 tokens
Input modalitiesText, images
Output modalitiesText
Comparative benchmark reportingSome reporting states that Opus 5.5 outpaced the larger Fable model in many benchmarks.
FAB (Furniture Assembly Benchmark) performanceReported score of 70% on the Furniture Assembly Benchmark (FAB), placing Claude Fable 5.1 behind GPT-6 Astra (80%) and ahead of Claude Opus 5 (61%), according to The Decoder.
AvailabilityActive on Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry and Claude Platform on AWS. Active (latest)
RELEASE TIMELINE
Published, source-backed release events only.
Google DeepMind unveils Gemini 4 Argon, a frontier model with 1M-token context
Google DeepMind announced Gemini 4 Argon, a new frontier multimodal model optimized for long-horizon reasoning and complex workflows. Argon is rolling out initially to trusted cyber defenders via the Fairwind Program, expands context length to 1 million tokens, reports leading benchmark performance across coding, finance, legal, and video understanding, and will be made more widely available after phased safety testing and engagement with U.S. government pre-release processes; Google also published introductory pricing.
SpaceXAI releases Grok 4.7 — faster, cheaper model for coding and knowledge work
SpaceXAI released Grok 4.7, a new base-model upgrade positioned as its most capable model for coding and knowledge work; it reportedly uses a larger base model, longer RL training focused on long-running tasks, and an entirely new safeguard stack. The company says Grok 4.7 matches the price and speed of Grok 4.6 while improving verification, longer-context handling, document/presentation generation, benchmark performance (CursorBench 4.0, GDPval, AA Briefcase), and safety metrics (LatchBio biosafety 62.4%, HackerBench v0.3 allowing 3.3% risky prompts); it is available in Cursor, Grok Build, the Grok API, third-party harnesses and cloud platforms, priced from $2 per million input tokens and $6 per million output tokens, with an optional faster (2x) variant at double the price.
VERIFIABLE FACTS
Every value stays attached to a source and date.
RELEASE · Release dateDEVELOPER CLAIM
2026-09-01
CONTEXT WINDOW · Context windowDEVELOPER CLAIM
1,000,000 tokens
CAPABILITIES · Maximum outputDEVELOPER CLAIM
128K tokens
MODALITIES · Input modalitiesDEVELOPER CLAIM
Text, images
MODALITIES · Output modalitiesDEVELOPER CLAIM
Text
AVAILABILITY · AvailabilityDEVELOPER CLAIM
Active on Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry and Claude Platform on AWS. Active (latest)
PRICING · Input priceDEVELOPER CLAIM
$10 USD / 1M input tokens; Claude API standard, global routing
PRICING · Output priceDEVELOPER CLAIM
$50 USD / 1M output tokens; Claude API standard, global routing
PRICING · Cached input priceDEVELOPER CLAIM
$0.25 USD / 1M cached input tokens; Claude API standard, global routing
SAFETY · Cybersecurity safeguardsDEVELOPER CLAIM
Anthropic states Claude Fable 5.1 has conservative cyber safeguards that block most cyber work to limit harmful activities.
SAFETY · Safeguard behavior (request routing)DEVELOPER CLAIM
Described as having safeguards that re-route certain cybersecurity-related requests to less-powerful models and route biology-related flagged requests to other models.
OTHER · Comparative performance (Opus 5.5)DEVELOPER CLAIM
Reportedly used as a performance reference: Anthropic said Opus 5.5 'matches Claude Fable 5.1 on most tasks' while costing about 40% less.
BENCHMARKS · Comparative benchmark reportingDEVELOPER CLAIM
Some reporting states that Opus 5.5 outpaced the larger Fable model in many benchmarks.
BENCHMARKS · FAB (Furniture Assembly Benchmark) performanceDEVELOPER CLAIM
Reported score of 70% on the Furniture Assembly Benchmark (FAB), placing Claude Fable 5.1 behind GPT-6 Astra (80%) and ahead of Claude Opus 5 (61%), according to The Decoder.
WHAT CHANGED
Stored passport versions, without reconstructed history.
SAFETY · Cybersecurity safeguards+ Anthropic states Claude Fable 5.1 has conservative cyber safeguards that block most cyber work to limit harmful activities.
SAFETY · Safety classifiers (domains)− Described as having safety classifiers covering biology, cyber security, and AI development; referenced in an AWS post that says Claude Opus 5.5 includes safety classifiers similar to Claude Fable 5.1.
BENCHMARKS · FAB (Furniture Assembly Benchmark) performance+ Reported score of 70% on the Furniture Assembly Benchmark (FAB), placing Claude Fable 5.1 behind GPT-6 Astra (80%) and ahead of Claude Opus 5 (61%), according to The Decoder.
SAFETY · Safety classifiers (domains)Reported to include safety classifiers covering biology, cybersecurity, and AI-development content.→Described as having safety classifiers covering biology, cyber security, and AI development; referenced in an AWS post that says Claude Opus 5.5 includes safety classifiers similar to Claude Fable 5.1.
AVAILABILITY · Availability+ Active on Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry and Claude Platform on AWS. Active (latest)
OTHER · Comparative performance (Opus 5.5)Reportedly used as a performance reference: Anthropic said Opus 5.5 'matches Claude Fable 5.1 on most tasks' while costing about 40% less.→Reportedly used as a performance reference: Anthropic said Opus 5.5 'matches Claude Fable 5.1 on most tasks' while costing about 40% less.
BENCHMARKS · Comparative benchmark reportingSome reporting states that Opus 5.5 outpaced the larger Fable model in many benchmarks.→Some reporting states that Opus 5.5 outpaced the larger Fable model in many benchmarks.
CONTEXT WINDOW · Context window+ 1,000,000 tokens
MODALITIES · Input modalities+ Text, images
CAPABILITIES · Maximum output+ 128K tokens
MODALITIES · Output modalities+ Text
PRICING · Cached input price+ $0.25 USD / 1M cached input tokens; Claude API standard, global routing
PRICING · Input price+ $10 USD / 1M input tokens; Claude API standard, global routing
PRICING · Output price+ $50 USD / 1M output tokens; Claude API standard, global routing
RELEASE · Release date+ 2026-09-01
SAFETY · Safeguard behavior (request routing)Described as having safeguards that re-route certain cybersecurity-related requests to less-powerful models and route biology-related flagged requests to other models.→Described as having safeguards that re-route certain cybersecurity-related requests to less-powerful models and route biology-related flagged requests to other models.
SAFETY · Safety classifiers (domains)Reported to include safety classifiers covering biology, cybersecurity, and AI-development content.→Reported to include safety classifiers covering biology, cybersecurity, and AI-development content.