The AI tools that
actually ship products

8.7

Grok 4.5

VS

9.6

Claude Fable 5

A split verdict between the cheapest frontier challenger and the most capable model of 2026, and we will not fake a single overall winner. Claude Fable 5 is the capability and verification leader: it tops the Artificial Analysis Intelligence Index at 60, ranks No.1 on LMArena at 1509 Elo, posts a leading 95 percent on the independently verified vals.ai SWE-bench Verified suite, carries the larger 1,000,000-token context, and is available in the European Union. Grok 4.5 is the value and throughput leader: it costs $2 per million input tokens and $6 per million output tokens against Fable 5's $10 and $50 — roughly five times cheaper on input and about eight times cheaper on output — is measured at about $2.49 per task against roughly $11.80 for Fable 5, posts a solid Artificial Analysis Coding Agent Index of 76, and is marketed as much faster, consistent with Anthropic's own Slower latency label on Fable 5. Grok 4.5 carries real caveats: it is not yet on the independent SWE-bench Verified or LMArena leaderboards, its AA-Omniscience factuality score of 26 comes with a 54 percent hallucination rate, and it is blocked in the European Union under the AI Act's systemic-risk provisions. Elon Musk's 'Opus-class, much faster' framing is partly supported on coding value and speed but overstated on general intelligence and reliability. Best for capability, independently verified coding, the larger context, and EU availability: Claude Fable 5. Best for cost, throughput, and speed outside the EU: Grok 4.5. No single overall winner — route capability-critical and EU-based work to Claude Fable 5, and cost-sensitive high-volume work outside the EU to Grok 4.5.

8.7

Grok 4.5

VS

8.6

GPT-5.5

A split verdict between the cheapest rate card and the most independently proven flagship, and we will not fake a single overall winner. Grok 4.5 reached public availability on July 9, 2026 as SpaceXAI's new flagship; GPT-5.5 has been OpenAI's established, still-active flagship since April 2026. On the rate card, Grok 4.5 is decisively cheaper: $2 per million input tokens and $6 per million output against GPT-5.5's $5 and $30 — less than half on both sides, verified on both vendors' own documentation — and Artificial Analysis measures its cost per task near the bottom of the frontier tier at about $2.49. SpaceXAI positions Grok 4.5 as 'Opus-class, much faster,' which we label as a vendor claim. GPT-5.5 answers with verified proof Grok 4.5 does not yet have: an independent SWE-bench Verified score of 82.6 percent on vals.ai, an LMArena Elo of 1481, a slightly higher Artificial Analysis Intelligence Index (55 to 54), more than double the context window (1,050,000 versus 500,000 tokens), a fuller native agentic tool stack, and EU availability that Grok 4.5 lacks under the AI Act. Independent agentic coding is roughly level — Artificial Analysis scores both near 76 on its Coding Agent Index. Best for the lowest token price, low cost per task, and vendor-stated speed on high-volume, non-EU work: Grok 4.5. Best for independently verified capability, long context, EU deployment, and a mature ecosystem: GPT-5.5. No single overall winner — route cost-sensitive, high-volume, non-EU work to Grok 4.5, and verification-critical, long-context, or EU work to GPT-5.5.

8.7

GPT-5.6 Terra

VS

8.7

Grok 4.5

A genuine split verdict between two value-tier frontier models that launched on the same day, July 9, 2026, and we will not fake a single overall winner. Grok 4.5 is the raw rate-card and speed play: at $2 per million input tokens and $6 per million output it is cheaper on both sides and 60 percent below GPT-5.6 Terra's $15 output, and SpaceXAI markets it as Opus-class and much faster, a vendor claim we do not treat as a benchmarked win. GPT-5.6 Terra is the measured-efficiency, longer-reach model: Artificial Analysis measures its cost per task at about $0.55 against Grok 4.5's $2.49 because it burns far fewer tokens per task, it edges the Intelligence Index 55 to 54 and the Coding Agent Index 77 to 76, carries more than double the context at 1,050,000 tokens, ships a fuller native tool stack with a documented February 16, 2026 cutoff, and is available in the EU where Grok 4.5 is blocked under the AI Act's systemic-risk provisions. Neither model has an independently verified SWE-bench Verified score — OpenAI did not submit Terra and Grok 4.5 is too new to appear — so verified coding is a tie by absence, and Grok 4.5 carries a standalone AA-Omniscience reliability caveat with a 54 percent hallucination rate. The pricing itself is split: the rate card favors Grok 4.5 while the independent cost-per-task figure favors Terra, and which governs your bill depends on how token-efficient your workload is. Best for the cheapest raw output rate and speed on non-EU work: Grok 4.5. Best for measured cost per task, long context, marginal capability edges, and EU deployment: GPT-5.6 Terra. No single overall winner — route raw high-volume output outside the EU to Grok 4.5, and reasoning-heavy, long-context, and EU-bound work to GPT-5.6 Terra.